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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 10 - Energy
 Chapter I - Nuclear Regulatory Commission
 Part 71 - Packaging and Transportation of Radioactive Material

  Appendix A to Part 71 - Determination of A1 and A2

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  • Appendix A to Part 71 - Determination of A1 and A2

    I. Values of A1 and A2 for individual radionuclides, which are the bases for many activity limits elsewhere in these regulations, are given in Table A-1. The curie (Ci) values specified are obtained by converting from the Terabecquerel (TBq) value. The Terabecquerel values are the regulatory standard. The curie values are for information only and are not intended to be the regulatory standard. Where values of A1 and A2 are unlimited, it is for radiation control purposes only. For nuclear criticality safety, some materials are subject to controls placed on fissile material.

    II.

    a. For individual radionuclides whose identities are known, but which are not listed in Table A-1, the A1 and A2 values contained in Table A-3 may be used. Otherwise, the licensee shall obtain prior Commission approval of the A1 and A2 values for radionuclides not listed in Table A-1, before shipping the material.

    b. For individual radionuclides whose identities are known, but which are not listed in Table A-2, the exempt material activity concentration and exempt consignment activity values contained in Table A-3 may be used. Otherwise, the licensee shall obtain prior Commission approval of the exempt material activity concentration and exempt consignment activity values for radionuclides not listed in Table A-2, before shipping the material.

    c. The licensee shall submit requests for prior approval, described under paragraphs II.a. and II.b. of this Appendix, to the Commission, in accordance with § 71.1 of this part.

    III. In the calculations of A1 and A2 for a radionuclide not in Table A-1, a single radioactive decay chain, in which radionuclides are present in their naturally occurring proportions, and in which no daughter radionuclide has a half-life either longer than 10 days, or longer than that of the parent radionuclide, shall be considered as a single radionuclide, and the activity to be taken into account, and the A1 and A2 value to be applied, shall be those corresponding to the parent radionuclide of that chain. In the case of radioactive decay chains in which any daughter radionuclide has a half-life either longer than 10 days, or greater than that of the parent radionuclide, the parent and those daughter radionuclides shall be considered as mixtures of different radionuclides.

    IV. For mixtures of radionuclides whose identities and respective activities are known, the following conditions apply:

    a. For special form radioactive material, the maximum quantity transported in a Type A package is as follows:

    where B(i) is the activity of radionuclide i in special form, and A1(i) is the A1 value for radionuclide i.

    b. For normal form radioactive material, the maximum quantity transported in a Type A package is as follows:

    where B(i) is the activity of radionuclide i in normal form, and A2(i) is the A2 value for radionuclide i.

    c. If the package contains both special and normal form radioactive material, the activity that may be transported in a Type A package is as follows:

    where B(i) is the activity of radionuclide i as special form radioactive material, A1(i) is the A1 value for radionuclide i, C(j) is the activity of radionuclide j as normal form radioactive material, and A2(j) is the A2 value for radionuclide j.

    d. Alternatively, the A1 value for mixtures of special form material may be determined as follows:

    where f(i) is the fraction of activity for radionuclide i in the mixture and A1(i) is the appropriate A1 value for radionuclide i.

    e. Alternatively, the A2 value for mixtures of normal form material may be determined as follows:

    where f(i) is the fraction of activity for radionuclide i in the mixture and A2(i) is the appropriate A2 value for radionuclide i.

    f. The exempt activity concentration for mixtures of nuclides may be determined as follows:

    where f(i) is the fraction of activity concentration of radionuclide i in the mixture and [A](i) is the activity concentration for exempt material containing radionuclide i.

    g. The activity limit for an exempt consignment for mixtures of radionuclides may be determined as follows:

    where f(i) is the fraction of activity of radionuclide i in the mixture and A(i) is the activity limit for exempt consignments for radionuclide i.

    V.

    a. When the identity of each radionuclide is known, but the individual activities of some of the radionuclides are not known, the radionuclides may be grouped, and the lowest A1 or A2 value, as appropriate, for the radionuclides in each group may be used in applying the formulas in paragraph IV. Groups may be based on the total alpha activity and the total beta/gamma activity when these are known, using the lowest A1 or A2 values for the alpha emitters and beta/gamma emitters.

    b. When the identity of each radionuclide is known but the individual activities of some of the radionuclides are not known, the radionuclides may be grouped and the lowest [A] (activity concentration for exempt material) or A (activity limit for exempt consignment) value, as appropriate, for the radionuclides in each group may be used in applying the formulas in paragraph IV of this appendix. Groups may be based on the total alpha activity and the total beta/gamma activity when these are known, using the lowest [A] or A values for the alpha emitters and beta/gamma emitters, respectively.

    Table A-1 - A1 and A2 Values For Radionuclides

    Symbol of
    radionuclide     		Element and
    atomic number     		A1 (TBq) A1 (Ci)b A2 (TBq) A2 (Ci)b Specific activity
    (TBq/g) (Ci/g)
    Ac-225 (a) Actinium (89) 8.0 × 10−1 2.2 × 101 6.0 × 10−3 1.6 × 10−1 2.1 × 103 5.8 × 104
    Ac-227 (a) 9.0 × 10−1 2.4 × 101 9.0 × 10−5 2.4 × 10−3 2.7 7.2 × 101
    Ac-228 6.0 × 10−1 1.6 × 101 5.0 × 10−1 1.4 × 101 8.4 × 104 2.2 × 106
    Ag-105 Silver (47) 2.0 5.4 × 101 2.0 5.4 × 101 1.1 × 103 3.0 × 104
    Ag-108m (a) 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 9.7 × 10−1 2.6 × 101
    Ag-110m (a) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 1.8 × 102 4.7 × 103
    Ag-111 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 5.8 × 103 1.6 × 105
    Al-26 Aluminum (13) 1.0 × 10−1 2.7 1.0 × 10−1 2.7 7.0 × 10−4 1.9 × 10−2
    Am-241 Americium (95) 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 1.3 × 10−1 3.4
    Am-242m (a) 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 3.6 × 10−1 1.0 × 101
    Am-243 (a) 5.0 1.4 × 102 1.0 × 10−3 2.7 × 10−2 7.4 × 10−3 2.0 × 10−1
    Ar-37 Argon (18) 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 3.7 × 103 9.9 × 104
    Ar-39 4.0 × 101 1.1 × 103 2.0 × 101 5.4 × 102 1.3 3.4 × 101
    Ar-41 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.5 × 106 4.2 × 107
    As-72 Arsenic (33) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 6.2 × 104 1.7 × 106
    As-73 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 8.2 × 102 2.2 × 104
    As-74 1.0 2.7 × 101 9.0 × 10−1 2.4 × 101 3.7 × 103 9.9 × 104
    As-76 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.8 × 104 1.6 × 106
    As-77 2.0 × 101 5.4 × 102 7.0 × 10−1 1.9 × 101 3.9 × 104 1.0 × 106
    At-211 (a) Astatine (85) 2.0 × 101 5.4 × 102 5.0 × 10−1 1.4 × 101 7.6 × 104 2.1 × 106
    Au-193 Gold (79) 7.0 1.9 × 102 2.0 5.4 × 101 3.4 × 104 9.2 × 105
    Au-194 1.0 2.7 × 101 1.0 2.7 × 101 1.5 × 104 4.1 × 105
    Au-195 1.0 × 101 2.7 × 102 6.0 1.6 × 102 1.4 × 102 3.7 × 103
    Au-198 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 9.0 × 103 2.4 × 105
    Au-199 1.0 × 101 2.7 × 102 6.0 × 10−1 1.6 × 101 7.7 × 103 2.1 × 105
    Ba-131 (a) Barium (56) 2.0 5.4 × 101 2.0 5.4 × 101 3.1 × 103 8.4 × 104
    Ba-133 3.0 8.1 × 101 3.0 8.1 × 101 9.4 2.6 × 102
    Ba-133m 2.0 × 101 5.4 × 102 6.0 × 10−1 1.6 × 101 2.2 × 104 6.1 × 105
    Ba-140 (a) 5.0 × 10−1 1.4 × 101 3.0 × 10−1 8.1 2.7 × 103 7.3 × 104
    Be-7 Beryllium (4) 2.0 × 101 5.4 × 102 2.0 × 101 5.4 × 102 1.3 × 104 3.5 × 105
    Be-10 4.0 × 101 1.1 × 103 6.0 × 10−1 1.6 × 101 8.3 × 10−4 2.2 × 10−2
    Bi-205 Bismuth (83) 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 1.5 × 103 4.2 × 104
    Bi-206 3.0 × 10−1 8.1 3.0 × 10−1 8.1 3.8 × 103 1.0 × 105
    Bi-207 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 1.9 5.2 × 101
    Bi-210 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 4.6 × 103 1.2 × 105
    Bi-210m (a) 6.0 × 10−1 1.6 × 101 2.0 × 10−2 5.4 × 10−1 2.1 × 10−5 5.7 × 10−4
    Bi-212 (a) 7.0 × 10−1 1.9 × 101 6.0 × 10−1 1.6 × 101 5.4 × 105 1.5 × 107
    Bk-247 Berkelium (97) 8.0 2.2 × 102 8.0 × 10−4 2.2 × 10−2 3.8 × 10−2 1.0
    Bk-249 (a) 4.0 × 101 1.1 × 103 3.0 × 10−1 8.1 6.1 × 101 1.6 × 103
    Br-76 Bromine (35) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 9.4 × 104 2.5 × 106
    Br-77 3.0 8.1 × 101 3.0 8.1 × 101 2.6 × 104 7.1 × 105
    Br-82 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 4.0 × 104 1.1 × 106
    C-11 Carbon (6) 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 3.1 × 107 8.4 × 108
    C-14 4.0 × 101 1.1 × 103 3.0 8.1 × 101 1.6 × 10−1 4.5
    Ca-41 Calcium (20) Unlimited Unlimited Unlimited Unlimited 3.1 × 10−3 8.5 × 10−2
    Ca-45 4.0 × 101 1.1 × 103 1.0 2.7 × 101 6.6 × 102 1.8 × 104
    Ca-47 (a) 3.0 8.1 × 101 3.0 × 10−1 8.1 2.3 × 104 6.1 × 105
    Cd-109 Cadmium (48) 3.0 × 101 8.1 × 102 2.0 5.4 × 101 9.6 × 101 2.6 × 103
    Cd-113m 4.0 × 101 1.1 × 103 5.0 × 10−1 1.4 × 101 8.3 2.2 × 102
    Cd-115 (a) 3.0 8.1 × 101 4.0 × 10−1 1.1 × 101 1.9 × 104 5.1 × 105
    Cd-115m 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 9.4 × 102 2.5 × 104
    Ce-139 Cerium (58) 7.0 1.9 × 102 2.0 5.4 × 101 2.5 × 102 6.8 × 103
    Ce-141 2.0 × 101 5.4 × 102 6.0 × 10−1 1.6 × 101 1.1 × 103 2.8 × 104
    Ce-143 9.0 × 10−1 2.4 × 101 6.0 × 10−1 1.6 × 101 2.5 × 104 6.6 × 105
    Ce-144 (a) 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.2 × 102 3.2 × 103
    Cf-248 Californium (98) 4.0 × 101 1.1 × 103 6.0 × 10−3 1.6 × 10−1 5.8 × 101 1.6 × 103
    Cf-249 3.0 8.1 × 101 8.0 × 10−4 2.2 × 10−2 1.5 × 10−1 4.1
    Cf-250 2.0 × 101 5.4 × 102 2.0 × 10−3 5.4 × 10−2 4.0 1.1 × 102
    Cf-251 7.0 1.9 × 102 7.0 × 10−4 1.9 × 10−2 5.9 × 10−2 1.6
    Cf-252 1.0 × 10−1 2.7 3.0 × 10−3 8.1 × 10−2 2.0 × 101 5.4 × 102
    Cf-253 (a) 4.0 × 101 1.1 × 103 4.0 × 10−2 1.1 1.1 × 103 2.9 × 104
    Cf-254 1.0 × 10−3 2.7 × 10−2 1.0 × 10−3 2.7 × 10−2 3.1 × 102 8.5 × 103
    Cl-36 Chlorine (17) 1.0 × 101 2.7 × 102 6.0 × 10−1 1.6 × 101 1.2 × 10−3 3.3 × 10−2
    Cl-38 2.0 × 10−1 5.4 2.0 × 10−1 5.4 4.9 × 106 1.3 × 108
    Cm-240 Curium (96) 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 7.5 × 102 2.0 × 104
    Cm-241 2.0 5.4 × 101 1.0 2.7 × 101 6.1 × 102 1.7 × 104
    Cm-242 4.0 × 101 1.1 × 103 1.0 × 10−2 2.7 × 10−1 1.2 × 102 3.3 × 103
    Cm-243 9.0 2.4 × 102 1.0 × 10−3 2.7 × 10−2 1.9 × 10−3 5.2 × 101
    Cm-244 2.0 × 101 5.4 × 102 2.0 × 10−3 5.4 × 10−2 3.0 8.1 × 101
    Cm-245 9.0 2.4 × 102 9.0 × 10−4 2.4 × 10−2 6.4 × 10−3 1.7 × 10−1
    Cm-246 9.0 2.4 × 102 9.0 × 10−4 2.4 × 10−2 1.1 × 10−2 3.1 × 10−1
    Cm-247 (a) 3.0 8.1 × 101 1.0 × 10−3 2.7 × 10−2 3.4 × 10−6 9.3 × 10−5
    Cm-248 2.0 × 10−2 5.4 × 10−1 3.0 × 10−4 8.1 × 10−3 1.6 × 10−4 4.2 × 10−3
    Co-55 Cobalt (27) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 1.1 × 105 3.1 × 106
    Co-56 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.1 × 103 3.0 × 104
    Co-57 1.0 × 101 2.7 × 102 1.0 × 101 2.7 × 102 3.1 × 102 8.4 × 103
    Co-58 1.0 2.7 × 101 1.0 2.7 × 101 1.2 × 103 3.2 × 104
    Co-58m 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 2.2 × 105 5.9 × 106
    Co-60 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 4.2 × 101 1.1 × 103
    Cr-51 Chromium (24) 3.0 × 101 8.1 × 102 3.0 × 101 8.1 × 102 3.4 × 103 9.2 × 104
    Cs-129 Cesium (55) 4.0 1.1 × 102 4.0 1.1 × 102 2.8 × 104 7.6 × 105
    Cs-131 3.0 × 101 8.1 × 102 3.0 × 101 8.1 × 102 3.8 × 103 1.0 × 105
    Cs-132 1.0 2.7 × 101 1.0 2.7 × 101 5.7 × 103 1.5 × 105
    Cs-134 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 4.8 × 101 1.3 × 103
    Cs-134m 4.0 × 101 1.1 × 103 6.0 × 10−1 1.6 × 101 3.0 × 105 8.0 × 106
    Cs-135 4.0 × 101 1.1 × 103 1.0 2.7 × 101 4.3 × 10−5 1.2 × 10−3
    Cs-136 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 2.7 × 103 7.3 × 104
    Cs-137 (a) 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 3.2 8.7 × 101
    Cu-64 Copper (29) 6.0 1.6 × 102 1.0 2.7 × 101 1.4 × 105 3.9 × 106
    Cu-67 1.0 × 101 2.7 × 102 7.0 × 10−1 1.9 × 101 2.8 × 104 7.6 × 105
    Dy-159 Dysprosium (66) 2.0 × 101 5.4 × 102 2.0 × 101 5.4 × 102 2.1 × 102 5.7 × 103
    Dy-165 9.0 × 10−1 2.4 × 101 6.0 × 10−1 1.6 × 101 3.0 × 105 8.2 × 106
    Dy-166 (a) 9.0 × 10−1 2.4 × 101 3.0 × 10−1 8.1 8.6 × 103 2.3 × 105
    Er-169 Erbium (68) 4.0 × 101 1.1 × 103 1.0 2.7 × 101 3.1 × 103 8.3 × 104
    Er-171 8.0 × 10−1 2.2 × 101 5.0 × 10−1 1.4 × 101 9.0 × 104 2.4 × 106
    Eu-147 Europium (63) 2.0 5.4 × 101 2.0 5.4 × 101 1.4 × 103 3.7 × 104
    Eu-148 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 6.0 × 102 1.6 × 104
    Eu-149 2.0 × 101 5.4 × 102 2.0 × 101 5.4 × 102 3.5 × 102 9.4 × 103
    Eu-150 (short lived) 2.0 5.4 × 101 7.0 × 10−1 1.9 × 101 6.1 × 104 1.6 × 106
    Eu-150 (long lived) 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 6.1 × 104 1.6 × 106
    Eu-152 1.0 2.7 × 101 1.0 2.7 × 101 6.5 1.8 × 102
    Eu-152m 8.0 × 10−1 2.2 × 101 8.0 × 10−1 2.2 × 101 8.2 × 104 2.2 × 106
    Eu-154 9.0 × 10−1 2.4 × 101 6.0 × 10−1 1.6 × 101 9.8 2.6 × 102
    Eu-155 2.0 × 101 5.4 × 102 3.0 8.1 × 101 1.8 × 101 4.9 × 102
    Eu-156 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 2.0 × 103 5.5 × 104
    F-18 Fluorine (9) 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 3.5 × 106 9.5 × 107
    Fe-52 (a) Iron (26) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.7 × 105 7.3 × 106
    Fe-55 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 8.8 × 101 2.4 × 103
    Fe-59 9.0 × 10−1 2.4 × 101 9.0 × 10−1 2.4 × 101 1.8 × 103 5.0 × 104
    Fe-60 (a) 4.0 × 101 1.1 × 103 2.0 × 10−1 5.4 7.4 × 10−4 2.0 × 10−2
    Ga-67 Gallium (31) 7.0 1.9 × 102 3.0 8.1 × 101 2.2 × 104 6.0 × 105
    Ga-68 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 1.5 × 106 4.1 × 107
    Ga-72 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 1.1 × 105 3.1 × 106
    Gd-146 (a) Gadolinium (64) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 6.9 × 102 1.9 × 104
    Gd-148 2.0 × 101 5.4 × 102 2.0 × 10−3 5.4 × 10−2 1.2 3.2 × 101
    Gd-153 1.0 × 101 2.7 × 102 9.0 2.4 × 102 1.3 × 102 3.5 × 103
    Gd-159 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 3.9 × 104 1.1 × 106
    Ge-68 (a) Germanium (32) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 2.6 × 102 7.1 × 103
    Ge-71 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 5.8 × 103 1.6 × 105
    Ge-77 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.3 × 105 3.6 × 106
    Hf-172 (a) Hafnium (72) 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 4.1 × 101 1.1 × 103
    Hf-175 3.0 8.1 × 101 3.0 8.1 × 101 3.9 × 102 1.1 × 104
    Hf-181 2.0 5.4 × 101 5.0 × 10−1 1.4 × 101 6.3 × 102 1.7 × 104
    Hf-182 Unlimited Unlimited Unlimited Unlimited 8.1 × 10−6 2.2 × 10−4
    Hg-194 (a) Mercury (80) 1.0 2.7 × 101 1.0 2.7 × 101 1.3 × 10−1 3.5
    Hg-195m (a) 3.0 8.1 × 101 7.0 × 10−1 1.9 × 101 1.5 × 104 4.0 × 105
    Hg-197 2.0 × 101 5.4 × 102 1.0 × 101 2.7 × 102 9.2 × 103 2.5 × 105
    Hg-197m 1.0 × 101 2.7 × 102 4.0 × 10−1 1.1 × 101 2.5 × 104 6.7 × 105
    Hg-203 5.0 1.4 × 102 1.0 2.7 × 101 5.1 × 102 1.4 × 104
    Ho-166 Holmium (67) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 2.6 × 104 7.0 × 105
    Ho-166m 6.0 × 10−1 1.6 × 101 5.0 × 10−1 1.4 × 101 6.6 × 10−2 1.8
    I-123 Iodine (53) 6.0 1.6 × 102 3.0 8.1 × 101 7.1 × 104 1.9 × 106
    I-124 1.0 2.7 × 101 1.0 2.7 × 101 9.3 × 103 2.5 × 105
    I-125 2.0 × 101 5.4 × 102 3.0 8.1 × 101 6.4 × 102 1.7 × 104
    I-126 2.0 5.4 × 101 1.0 2.7 × 101 2.9 × 103 8.0 × 104
    I-129 Unlimited Unlimited Unlimited Unlimited 6.5 × 10−6 1.8 × 10−4
    I-131 3.0 8.1 × 101 7.0 × 10−1 1.9 × 101 4.6 × 103 1.2 × 105
    I-132 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 3.8 × 105 1.0 × 107
    I-133 7.0 × 10−1 1.9 × 101 6.0 × 10−1 1.6 × 101 4.2 × 104 1.1 × 106
    I-134 3.0 × 10−1 8.1 3.0 × 10−1 8.1 9.9 × 105 2.7 × 107
    I-135 (a) 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 1.3 × 105 3.5 × 106
    In-111 Indium (49) 3.0 8.1 × 101 3.0 8.1 × 101 1.5 × 104 4.2 × 105
    In-113m 4.0 1.1 × 102 2.0 5.4 × 101 6.2 × 105 1.7 × 107
    In-114m (a) 1.0 × 101 2.7 × 102 5.0 × 10−1 1.4 × 101 8.6 × 102 2.3 × 104
    In-115m 7.0 1.9 × 102 1.0 2.7 × 101 2.2 × 105 6.1 × 106
    Ir-189 (a) Iridium (77) 1.0 × 101 2.7 × 102 1.0 × 101 2.7 × 102 1.9 × 103 5.2 × 104
    Ir-190 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 2.3 × 103 6.2 × 104
    Ir-192 c 1.0 c 2.7 × 101 6.0 × 10−1 1.6 × 101 3.4 × 102 9.2 × 103
    Ir-194 3.0 × 10−1 8.1 3.0 × 10−1 8.1 3.1 × 104 8.4 × 105
    K-40 Potassium (19) 9.0 × 10−1 2.4 × 101 9.0 × 10−1 2.4 × 101 2.4 × 10−7 6.4 × 10−6
    K-42 2.0 × 10−1 5.4 2.0 × 10−1 5.4 2.2 × 105 6.0 × 106
    K-43 7.0 × 10−1 1.9 × 101 6.0 × 10−1 1.6 × 101 1.2 × 105 3.3 × 106
    Kr-79 Krypton (36) 4.0 1.1 × 102 2.0 5.4 × 101 4.2 × 104 1.1 × 106
    Kr-81 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 7.8 × 10−4 2.1 × 10−2
    Kr-85 1.0 × 101 2.7 × 102 1.0 × 101 2.7 × 102 1.5 × 101 3.9 × 102
    Kr-85m 8.0 2.2 × 102 3.0 8.1 × 101 3.0 × 105 8.2 × 106
    Kr-87 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.0 × 106 2.8 × 107
    La-137 Lanthanum (57) 3.0 × 101 8.1 × 102 6.0 1.6 × 102 1.6 × 10−3 4.4 × 10−2
    La-140 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 2.1 × 104 5.6 × 105
    Lu-172 Lutetium (71) 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 4.2 × 103 1.1 × 105
    Lu-173 8.0 2.2 × 102 8.0 2.2 × 102 5.6 × 101 1.5 × 103
    Lu-174 9.0 2.4 × 102 9.0 2.4 × 102 2.3 × 101 6.2 × 102
    Lu-174m 2.0 × 101 5.4 × 102 1.0 × 101 2.7 × 102 2.0 × 102 5.3 × 103
    Lu-177 3.0 × 101 8.1 × 102 7.0 × 10−1 1.9 × 101 4.1 × 103 1.1 × 105
    Mg-28 (a) Magnesium (12) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.0 × 105 5.4 × 106
    Mn-52 Manganese (25) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.6 × 104 4.4 × 105
    Mn-53 Unlimited Unlimited Unlimited Unlimited 6.8 × 10−5 1.8 × 10−3
    Mn-54 1.0 2.7 × 101 1.0 2.7 × 101 2.9 × 102 7.7 × 103
    Mn-56 3.0 × 10−1 8.1 3.0 × 10−1 8.1 8.0 × 105 2.2 × 107
    Mo-93 Molybdenum (42) 4.0 × 101 1.1 × 103 2.0 × 101 5.4 × 102 4.1 × 10−2 1.1
    Mo-99ah 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 1.8 × 104 4.8 × 105
    N-13 Nitrogen (7) 9.0 × 10−1 2.4 × 101 6.0 × 10−1 1.6 × 101 5.4 × 107 1.5 × 109
    Na-22 Sodium (11) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 2.3 × 102 6.3 × 103
    Na-24 2.0 × 10−1 5.4 2.0 × 10−1 5.4 3.2 × 105 8.7 × 106
    Nb-93m Niobium (41) 4.0 × 101 1.1 × 103 3.0 × 101 8.1 × 102 8.8 2.4 × 102
    Nb-94 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 6.9 × 10−3 1.9 × 10−1
    Nb-95 1.0 2.7 × 101 1.0 2.7 × 101 1.5 × 103 3.9 × 104
    Nb-97 9.0 × 10−1 2.4 × 101 6.0 × 10−1 1.6 × 101 9.9 × 105 2.7 × 107
    Nd-147 Neodymium (60) 6.0 1.6 × 102 6.0 × 10−1 1.6 × 101 3.0 × 103 8.1 × 104
    Nd-149 6.0 × 10−1 1.6 × 101 5.0 × 10−1 1.4 × 101 4.5 × 105 1.2 × 107
    Ni-59 Nickel (28) Unlimited Unlimited Unlimited Unlimited 3.0 × 10−3 8.0 × 10−2
    Ni-63 4.0 × 101 1.1 × 103 3.0 × 101 8.1 × 102 2.1 5.7 × 101
    Ni-65 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 7.1 × 105 1.9 × 107
    Np-235 Neptunium (93) 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 5.2 × 101 1.4 × 103
    Np-236 (short-lived) 2.0 × 101 5.4 × 102 2.0 5.4 × 101 4.7 × 10−4 1.3 × 10−2
    Np-236 (long-lived) 9.0 × 100 2.4 × 102 2.0 × 10−2 5.4 × 10−1 4.7 × 10−4 1.3 × 10−2
    Np-237 2.0 × 101 5.4 × 102 2.0 × 10−3 5.4 × 10−2 2.6 × 10−5 7.1 × 10−4
    Np-239 7.0 1.9 × 102 4.0 × 10−1 1.1 × 101 8.6 × 103 2.3 × 105
    Os-185 Osmium (76) 1.0 2.7 × 101 1.0 2.7 × 101 2.8 × 102 7.5 × 103
    Os-191 1.0 × 101 2.7 × 102 2.0 5.4 × 101 1.6 × 103 4.4 × 104
    Os-191m 4.0 × 101 1.1 × 103 3.0 × 101 8.1 × 102 4.6 × 104 1.3 × 106
    Os-193 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 2.0 × 104 5.3 × 105
    Os-194 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.1 × 101 3.1 × 102
    P-32 Phosphorus (15) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 1.1 × 104 2.9 × 105
    P-33 4.0 × 101 1.1 × 103 1.0 2.7 × 101 5.8 × 103 1.6 × 105
    Pa-230 (a) Protactinium (91) 2.0 5.4 × 101 7.0 × 10−2 1.9 1.2 × 103 3.3 × 104
    Pa-231 4.0 1.1 × 102 4.0 × 10−4 1.1 × 10−2 1.7 × 10−3 4.7 × 10−2
    Pa-233 5.0 1.4 × 102 7.0 × 10−1 1.9 × 101 7.7 × 102 2.1 × 104
    Pb-201 Lead (82) 1.0 2.7 × 101 1.0 2.7 × 101 6.2 × 104 1.7 × 106
    Pb-202 4.0 × 101 1.1 × 103 2.0 × 101 5.4 × 102 1.2 × 10−4 3.4 × 10−3
    Pb-203 4.0 1.1 × 102 3.0 8.1 × 101 1.1 × 104 3.0 × 105
    Pb-205 Unlimited Unlimited Unlimited Unlimited 4.5 × 10−6 1.2 × 10−4
    Pb-210 (a) 1.0 2.7 × 101 5.0 × 10−2 1.4 2.8 7.6 × 101
    Pb-212 (a) 7.0 × 10−1 1.9 × 101 2.0 × 10−1 5.4 5.1 × 104 1.4 × 106
    Pd-103 (a) Palladium (46) 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 2.8 × 103 7.5 × 104
    Pd-107 Unlimited Unlimited Unlimited Unlimited 1.9 × 10−5 5.1 × 10−4
    Pd-109 2.0 5.4 × 101 5.0 × 10−1 1.4 × 101 7.9 × 104 2.1 × 106
    Pm-143 Promethium (61) 3.0 8.1 × 101 3.0 8.1 × 101 1.3 × 102 3.4 × 103
    Pm-144 7.0 × 10−1 1.9 × 101 7.0 × 10−1 1.9 × 101 9.2 × 101 2.5 × 103
    Pm-145 3.0 × 101 8.1 × 102 1.0 × 101 2.7 × 102 5.2 1.4 × 102
    Pm-147 4.0 × 101 1.1 × 103 2.0 5.4 × 101 3.4 × 101 9.3 × 102
    Pm-148m (a) 8.0 × 10−1 2.2 × 101 7.0 × 10−1 1.9 × 101 7.9 × 102 2.1 × 104
    Pm-149 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 1.5 × 104 4.0 × 105
    Pm-151 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 2.7 × 104 7.3 × 105
    Po-210 Polonium (84) 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 1.7 × 102 4.5 × 103
    Pr-142 Praseodymium (59) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 4.3 × 104 1.2 × 106
    Pr-143 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 2.5 × 103 6.7 × 104
    Pt-188 (a) Platinum (78) 1.0 2.7 × 101 8.0 × 10−1 2.2 × 101 2.5 × 103 6.8 × 104
    Pt-191 4.0 1.1 × 102 3.0 8.1 × 101 8.7 × 103 2.4 × 105
    Pt-193 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 1.4 3.7 × 101
    Pt-193m 4.0 × 101 1.1 × 103 5.0 × 10−1 1.4 × 101 5.8 × 103 1.6 × 105
    Pt-195m 1.0 × 101 2.7 × 102 5.0 × 10−1 1.4 × 101 6.2 × 103 1.7 × 105
    Pt-197 2.0 × 101 5.4 × 102 6.0 × 10−1 1.6 × 101 3.2 × 104 8.7 × 105
    Pt-197m 1.0 × 101 2.7 × 102 6.0 × 10−1 1.6 × 101 3.7 × 105 1.0 × 107
    Pu-236 Plutonium (94) 3.0 × 101 8.1 × 102 3.0 × 10−3 8.1 × 10−2 2.0 × 101 5.3 × 102
    Pu-237 2.0 × 101 5.4 × 102 2.0 × 101 5.4 × 102 4.5 × 102 1.2 × 104
    Pu-238 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 6.3 × 10−1 1.7 × 101
    Pu-239 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 2.3 × 10−3 6.2 × 10−2
    Pu-240 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 8.4 × 10−3 2.3 × 10−1
    Pu-241 (a) 4.0 × 101 1.1 × 103 6.0 × 10−2 1.6 3.8 1.0 × 102
    Pu-242 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 1.5 × 10−4 3.9 × 10−3
    Pu-244 (a) 4.0 × 10−1 1.1 × 101 1.0 × 10−3 2.7 × 10−2 6.7 × 10−7 1.8 × 10−5
    Ra-223 (a) Radium (88) 4.0 × 10−1 1.1 × 101 7.0 × 10−3 1.9 × 10−1 1.9 × 103 5.1 × 104
    Ra-224 (a) 4.0 × 10−1 1.1 × 101 2.0 × 10−2 5.4 × 10−1 5.9 × 103 1.6 × 105
    Ra-225 (a) 2.0 × 10−1 5.4 4.0 × 10−3 1.1 × 10−1 1.5 × 103 3.9 × 104
    Ra-226 (a) 2.0 × 10−1 5.4 3.0 × 10−3 8.1 × 10−2 3.7 × 10−2 1.0
    Ra-228 (a) 6.0 × 10−1 1.6 × 101 2.0 × 10−2 5.4 × 10−1 1.0 × 101 2.7 × 102
    Rb-81 Rubidium (37) 2.0 5.4 × 101 8.0 × 10−1 2.2 × 101 3.1 × 105 8.4 × 106
    Rb-83 (a) 2.0 5.4 × 101 2.0 5.4 × 101 6.8 × 102 1.8 × 104
    Rb-84 1.0 2.7 × 101 1.0 2.7 × 101 1.8 × 103 4.7 × 104
    Rb-86 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 3.0 × 103 8.1 × 104
    Rb-87 Unlimited Unlimited Unlimited Unlimited 3.2 × 10−9 8.6 × 10−8
    Rb(nat) Unlimited Unlimited Unlimited Unlimited 6.7 × 106 1.8 × 108
    Re-184 Rhenium (75) 1.0 2.7 × 101 1.0 2.7 × 101 6.9 × 102 1.9 × 104
    Re-184m 3.0 8.1 × 101 1.0 2.7 × 101 1.6 × 102 4.3 × 103
    Re-186 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 6.9 × 103 1.9 × 105
    Re-187 Unlimited Unlimited Unlimited Unlimited 1.4 × 10−9 3.8 × 10−8
    Re-188 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 3.6 × 104 9.8 × 105
    Re-189 (a) 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 2.5 × 104 6.8 × 105
    Re(nat) Unlimited Unlimited Unlimited Unlimited 0.0 2.4 × 10−8
    Rh-99 Rhodium (45) 2.0 5.4 × 101 2.0 5.4 × 101 3.0 × 103 8.2 × 104
    Rh-101 4.0 1.1 × 102 3.0 8.1 × 101 4.1 × 101 1.1 × 103
    Rh-102 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 4.5 × 101 1.2 × 103
    Rh-102m 2.0 5.4 × 101 2.0 5.4 × 101 2.3 × 102 6.2 × 103
    Rh-103m 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 1.2 × 106 3.3 × 107
    Rh-105 1.0 × 101 2.7 × 102 8.0 × 10−1 2.2 × 101 3.1 × 104 8.4 × 105
    Rn-222 (a) Radon (86) 3.0 × 10−1 8.1 4.0 × 10−3 1.1 × 10−1 5.7 × 103 1.5 × 105
    Ru-97 Ruthenium (44) 5.0 1.4 × 102 5.0 1.4 × 102 1.7 × 104 4.6 × 105
    Ru-103 (a) 2.0 5.4 × 101 2.0 5.4 × 101 1.2 × 103 3.2 × 104
    Ru-105 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 2.5 × 105 6.7 × 106
    Ru-106 (a) 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.2 × 102 3.3 × 103
    S-35 Sulphur (16) 4.0 × 101 1.1 × 103 3.0 8.1 × 101 1.6 × 103 4.3 × 104
    Sb-122 Antimony (51) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 1.5 × 104 4.0 × 105
    Sb-124 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 6.5 × 102 1.7 × 104
    Sb-125 2.0 5.4 × 101 1.0 2.7 × 101 3.9 × 101 1.0 × 103
    Sb-126 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 3.1 × 103 8.4 × 104
    Sc-44 Scandium (21) 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 6.7 × 105 1.8 × 107
    Sc-46 5.0 × 10−1 1.4 × 101 5.0 × 10−1 1.4 × 101 1.3 × 103 3.4 × 104
    Sc-47 1.0 × 101 2.7 × 102 7.0 × 10−1 1.9 × 101 3.1 × 104 8.3 × 105
    Sc-48 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.5 × 104 1.5 × 106
    Se-75 Selenium (34) 3.0 8.1 × 101 3.0 8.1 × 101 5.4 × 102 1.5 × 104
    Se-79 4.0 × 101 1.1 × 103 2.0 5.4 × 101 2.6 × 10−3 7.0 × 10−2
    Si-31 Silicon (14) 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 1.4 × 106 3.9 × 107
    Si-32 4.0 × 101 1.1 × 103 5.0 × 10−1 1.4 × 101 3.9 1.1 × 102
    Sm-145 Samarium (62) 1.0 × 101 2.7 × 102 1.0 × 101 2.7 × 102 9.8 × 101 2.6 × 103
    Sm-147 Unlimited Unlimited Unlimited Unlimited 8.5 × 10−10 2.3 × 10−8
    Sm-151 4.0 × 101 1.1 × 103 1.0 × 101 2.7 × 102 9.7 × 10−1 2.6 × 101
    Sm-153 9.0 2.4 × 102 6.0 × 10−1 1.6 × 101 1.6 × 104 4.4 × 105
    Sn-113 (a) Tin (50) 4.0 1.1 × 102 2.0 5.4 × 101 3.7 × 102 1.0 × 104
    Sn-117m 7.0 1.9 × 102 4.0 × 10−1 1.1 × 101 3.0 × 103 8.2 × 104
    Sn-119m 4.0 × 101 1.1 × 103 3.0 × 101 8.1 × 102 1.4 × 102 3.7 × 103
    Sn-121m (a) 4.0 × 101 1.1 × 103 9.0 × 10−1 2.4 × 101 2.0 5.4 × 101
    Sn-123 8.0 × 10−1 2.2 × 101 6.0 × 10−1 1.6 × 101 3.0 × 102 8.2 × 103
    Sn-125 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 4.0 × 103 1.1 × 105
    Sn-126 (a) 6.0 × 10−1 1.6 × 101 4.0 × 10−1 1.1 × 101 1.0 × 10−3 2.8 × 10−2
    Sr-82 (a) Strontium (38) 2.0 × 10−1 5.4 2.0 × 10−1 5.4 2.3 × 103 6.2 × 104
    Sr-85 2.0 5.4 × 101 2.0 5.4 × 101 8.8 × 102 2.4 × 104
    Sr-85m 5.0 1.4 × 102 5.0 1.4 × 102 1.2 × 106 3.3 × 107
    Sr-87m 3.0 8.1 × 101 3.0 8.1 × 101 4.8 × 105 1.3 × 107
    Sr-89 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 1.1 × 103 2.9 × 104
    Sr-90 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.1 1.4 × 102
    Sr-91 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.3 × 105 3.6 × 106
    Sr-92 (a) 1.0 2.7 × 101 3.0 × 10−1 8.1 4.7 × 105 1.3 × 107
    T(H-3) Tritium (1) 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 3.6 × 102 9.7 × 103
    Ta-178 (long-lived) Tantalum (73) 1.0 2.7 × 101 8.0 × 10−1 2.2 × 101 4.2 × 106 1.1 × 108
    Ta-179 3.0 × 101 8.1 × 102 3.0 × 101 8.1 × 102 4.1 × 101 1.1 × 103
    Ta-182 9.0 × 10−1 2.4 × 101 5.0 × 10−1 1.4 × 101 2.3 × 102 6.2 × 103
    Tb-157 Terbium (65) 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 5.6 × 10−1 1.5 × 101
    Tb-158 1.0 2.7 × 101 1.0 2.7 × 101 5.6 × 10−1 1.5 × 101
    Tb-160 1.0 2.7 × 101 6.0 × 10−1 1.6 × 101 4.2 × 102 1.1 × 104
    Tc-95m (a) Technetium (43) 2.0 5.4 × 101 2.0 5.4 × 101 8.3 × 102 2.2 × 104
    Tc-96 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 1.2 × 104 3.2 × 105
    Tc-96m (a) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 1.4 × 106 3.8 × 107
    Tc-97 Unlimited Unlimited Unlimited Unlimited 5.2 × 10−5 1.4 × 10−3
    Tc-97m 4.0 × 101 1.1 × 103 1.0 2.7 × 101 5.6 × 102 1.5 × 104
    Tc-98 8.0 × 10−1 2.2 × 101 7.0 × 10−1 1.9 × 101 3.2 × 10−5 8.7 × 10−4
    Tc-99 4.0 × 101 1.1 × 103 9.0 × 10−1 2.4 × 101 6.3 × 10−4 1.7 × 10−2
    Tc-99m 1.0 × 101 2.7 × 102 4.0 1.1 × 102 1.9 × 105 5.3 × 106
    Te-121 Tellurium (52) 2.0 5.4 × 101 2.0 5.4 × 101 2.4 × 103 6.4 × 104
    Te-121m 5.0 1.4 × 102 3.0 8.1 × 101 2.6 × 102 7.0 × 103
    Te-123m 8.0 2.2 × 102 1.0 2.7 × 101 3.3 × 102 8.9 × 103
    Te-125m 2.0 × 101 5.4 × 102 9.0 × 10−1 2.4 × 101 6.7 × 102 1.8 × 104
    Te-127 2.0 × 101 5.4 × 102 7.0 × 10−1 1.9 × 101 9.8 × 104 2.6 × 106
    Te-127m (a) 2.0 × 101 5.4 × 102 5.0 × 10−1 1.4 × 101 3.5 × 102 9.4 × 103
    Te-129 7.0 × 10−1 1.9 × 101 6.0 × 10−1 1.6 × 101 7.7 × 105 2.1 × 107
    Te-129m (a) 8.0 × 10−1 2.2 × 101 4.0 × 10−1 1.1 × 101 1.1 × 103 3.0 × 104
    Te-131m (a) 7.0 × 10−1 1.9 × 101 5.0 × 10−1 1.4 × 101 3.0 × 104 8.0 × 105
    Te-132 (a) 5.0 × 10−1 1.4 × 101 4.0 × 10−1 1.1 × 101 1.1 × 104 3.0 × 105
    Th-227 Thorium (90) 1.0 × 101 2.7 × 102 5.0 × 10−3 1.4 × 10−1 1.1 × 103 3.1 × 104
    Th-228 (a) 5.0 × 10−1 1.4 × 101 1.0 × 10−3 2.7 × 10−2 3.0 × 101 8.2 × 102
    Th-229 5.0 1.4 × 102 5.0 × 10−4 1.4 × 10−2 7.9 × 10−3 2.1 × 10−1
    Th-230 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 7.6 × 10−4 2.1 × 10−2
    Th-231 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 2.0 × 104 5.3 × 105
    Th-232 Unlimited Unlimited Unlimited Unlimited 4.0 × 10−9 1.1 × 10−7
    Th-234 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 8.6 × 102 2.3 × 104
    Th(nat) Unlimited Unlimited Unlimited Unlimited 8.1 × 10−9 2.2 × 10−7
    Ti-44 (a) Titanium (22) 5.0 × 10−1 1.4 × 101 4.0 × 10−1 1.1 × 101 6.4 1.7 × 102
    Tl-200 Thallium (81) 9.0 × 10−1 2.4 × 101 9.0 × 10−1 2.4 × 101 2.2 × 104 6.0 × 105
    Tl-201 1.0 × 101 2.7 × 102 4.0 1.1 × 102 7.9 × 103 2.1 × 105
    Tl-202 2.0 5.4 × 101 2.0 5.4 × 101 2.0 × 103 5.3 × 104
    Tl-204 1.0 × 101 2.7 × 102 7.0 × 10−1 1.9 × 101 1.7 × 101 4.6 × 102
    Tm-167 Thulium (69) 7.0 1.9 × 102 8.0 × 10−1 2.2 × 101 3.1 × 103 8.5 × 104
    Tm-170 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 2.2 × 102 6.0 × 103
    Tm-171 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103
    U-230 (fast lung absorption) (a)(d) Uranium (92) 4.0 × 101 1.1 × 103 1.0 × 10−1 2.7 1.0 × 103 2.7 × 104
    U-230 (medium lung absorption) (a)(e) 4.0 × 101 1.1 × 103 4.0 × 10−3 1.1 × 10−1 1.0 × 103 2.7 × 104
    U-230 (slow lung absorption) (a)(f) 3.0 × 101 8.1 × 102 3.0 × 10−3 8.1 × 10−2 1.0 × 103 2.7 × 104
    U-232 (fast lung absorption) (d) 4.0 × 101 1.1 × 103 1.0 × 10−2 2.7 × 10−1 8.3 × 10−1 2.2 × 101
    U-232 (medium lung absorption) (e) 4.0 × 101 1.1 × 103 7.0 × 10−3 1.9 × 10−1 8.3 × 10−1 2.2 × 101
    U-232 (slow lung absorption) (f) 1.0 × 101 2.7 × 102 1.0 × 10−3 2.7 × 10−2 8.3 × 10−1 2.2 × 101
    U-233 (fast lung absorption) (d) 4.0 × 101 1.1 × 103 9.0 × 10−2 2.4 3.6 × 10−4 9.7 × 10−3
    U-233 (medium lung absorption) (e) 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 3.6 × 10−4 9.7 × 10−3
    U-233 (slow lung absorption) (f) 4.0 × 101 1.1 × 103 6.0 × 10−3 1.6 × 10−1 3.6 × 10−4 9.7 × 10−3
    U-234 (fast lung absorption) (d) 4.0 × 101 1.1 × 103 9.0 × 10−2 2.4 2.3 × 10−4 6.2 × 10−3
    U-234 (medium lung absorption) (e) 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 2.3 × 10−4 6.2 × 10−3
    U-234 (slow lung absorption) (f) 4.0 × 101 1.1 × 103 6.0 × 10−3 1.6 × 10−1 2.3 × 10−4 6.2 × 10−3
    U-235 (all lung absorption types) (a),(d),(e),(f) Unlimited Unlimited Unlimited Unlimited 8.0 × 10−8 2.2 × 10−6
    U-236 (fast lung absorption) (d) Unlimited Unlimited Unlimited Unlimited 2.4 × 10−6 6.5 × 10−5
    U-236 (medium lung absorption) (e) 4.0 × 101 1.1 × 103 2.0 × 10−2 5.4 × 10−1 2.4 × 10−6 6.5 × 10−5
    U-236 (slow lung absorption) (f) 4.0 × 101 1.1 × 103 6.0 × 10−3 1.6 × 10−1 2.4 × 10−6 6.5 × 10−5
    U-238 (all lung absorption types) (d),(e),(f) Unlimited Unlimited Unlimited Unlimited 1.2 × 10−8 3.4 × 10−7
    U (nat) Unlimited Unlimited Unlimited Unlimited 2.6 × 10−8 7.1 × 10−7
    U (enriched to 20% or less)(g) Unlimited Unlimited Unlimited Unlimited See Table A-4 See Table A-4
    U (dep) Unlimited Unlimited Unlimited Unlimited See Table A-4 See Table A-4
    V-48 Vanadium (23) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 6.3 × 103 1.7 × 105
    V-49 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 3.0 × 102 8.1 × 103
    W-178 (a) Tungsten (74) 9.0 2.4 × 102 5.0 1.4 × 102 1.3 × 103 3.4 × 104
    W-181 3.0 × 101 8.1 × 102 3.0 × 101 8.1 × 102 2.2 × 102 6.0 × 103
    W-185 4.0 × 101 1.1 × 103 8.0 × 10−1 2.2 × 101 3.5 × 102 9.4 × 103
    W-187 2.0 5.4 × 101 6.0 × 10−1 1.6 × 101 2.6 × 104 7.0 × 105
    W-188 (a) 4.0 × 10−1 1.1 × 101 3.0 × 10−1 8.1 3.7 × 102 1.0 × 104
    Xe-122 (a) Xenon (54) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 4.8 × 104 1.3 × 106
    Xe-123 2.0 5.4 × 101 7.0 × 10−1 1.9 × 101 4.4 × 105 1.2 × 107
    Xe-127 4.0 1.1 × 102 2.0 5.4 × 101 1.0 × 103 2.8 × 104
    Xe-131m 4.0 × 101 1.1 × 103 4.0 × 101 1.1 × 103 3.1 × 103 8.4 × 104
    Xe-133 2.0 × 101 5.4 × 102 1.0 × 101 2.7 × 102 6.9 × 103 1.9 × 105
    Xe-135 3.0 8.1 × 101 2.0 5.4 × 101 9.5 × 104 2.6 × 106
    Y-87 (a) Yttrium (39) 1.0 2.7 × 101 1.0 2.7 × 101 1.7 × 104 4.5 × 105
    Y-88 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 5.2 × 102 1.4 × 104
    Y-90 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.0 × 104 5.4 × 105
    Y-91 6.0 × 10−1 1.6 × 101 6.0 × 10−1 1.6 × 101 9.1 × 102 2.5 × 104
    Y-91m 2.0 5.4 × 101 2.0 5.4 × 101 1.5 × 106 4.2 × 107
    Y-92 2.0 × 10−1 5.4 2.0 × 10−1 5.4 3.6 × 105 9.6 × 106
    Y-93 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.2 × 105 3.3 × 106
    Yb-169 Ytterbium (70) 4.0 1.1 × 102 1.0 2.7 × 101 8.9 × 102 2.4 × 104
    Yb-175 3.0 × 101 8.1 × 102 9.0 × 10−1 2.4 × 101 6.6 × 103 1.8 × 105
    Zn-65 Zinc (30) 2.0 5.4 × 101 2.0 5.4 × 101 3.0 × 102 8.2 × 103
    Zn-69 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 1.8 × 106 4.9 × 107
    Zn-69m (a) 3.0 8.1 × 101 6.0 × 10−1 1.6 × 101 1.2 × 105 3.3 × 106
    Zr-88 Zirconium (40) 3.0 8.1 × 101 3.0 8.1 × 101 6.6 × 102 1.8 × 104
    Zr-93 Unlimited Unlimited Unlimited Unlimited 9.3 × 10−5 2.5 × 10−3
    Zr-95 (a) 2.0 5.4 × 101 8.0 × 10−1 2.2 × 101 7.9 × 102 2.1 × 104
    Zr-97 (a) 4.0 × 10−1 1.1 × 101 4.0 × 10−1 1.1 × 101 7.1 × 104 1.9 × 106

    a A1 and/or A2 values include contributions from daughter nuclides with half-lives less than 10 days, as listed in the following:

    Mg-28 Al-28
    Ca-47 Sc-47
    Ti-44 Sc-44
    Fe-52 Mn-52m
    Fe-60 Co-60m
    Zn-69m Zn-69
    Ge-68 Ga-68
    Rb-83 Kr-83m
    Sr-82 Rb-82
    Sr-90 Y-90
    Sr-91 Y-91m
    Sr-92 Y-92
    Y-87 Sr-87m
    Zr-95 Nb-95m
    Zr-97 Nb-97m, Nb-97
    Mo-99 Tc-99m
    Tc-95m Tc-95
    Tc-96m Tc-96
    Ru-103 Rh-103m
    Ru-106 Rh-106
    Pd-103 Rh-103m
    Ag-108m Ag-108
    Ag-110m Ag-110
    Cd-115 In-115m
    In-114m In-114
    Sn-113 In-113m
    Sn-121m Sn-121
    Sn-126 Sb-126m
    Te-127m Te-127
    Te-129m Te-129
    Te-131m Te-131
    Te-132 I-132
    I-135 Xe-135m
    Xe-122 I-122
    Cs-137 Ba-137m
    Ba-131 Cs-131
    Ba-140 La-140
    Ce-144 Pr-144m, Pr-144
    Pm-148m Pm-148
    Gd-146 Eu-146
    Dy-166 Ho-166
    Hf-172 Lu-172
    W-178 Ta-178
    W-188 Re-188
    Re-189 Os-189m
    Os-194 Ir-194
    Ir-189 Os-189m
    Pt-188 Ir-188
    Hg-194 Au-194
    Hg-195m Hg-195
    Pb-210 Bi-210
    Pb-212 Bi-212, Tl-208, Po-212
    Bi-210m Tl-206
    Bi-212 Tl-208, Po-212
    At-211 Po-211
    Rn-222 Po-218, Pb-214, At-218, Bi-214, Po-214
    Ra-223 Rn-219, Po-215, Pb-211, Bi-211, Po-211, Tl-207
    Ra-224 Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212
    Ra-225 Ac-225, Fr-221, At-217, Bi-213, Tl-209, Po-213, Pb-209
    Ra-226 Rn-222, Po-218, Pb-214, At-218, Bi-214, Po-214
    Ra-228 Ac-228
    Ac-225 Fr-221, At-217, Bi-213, Tl-209, Po-213, Pb-209
    Ac-227 Fr-223
    Th-228 Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212
    Th-234 Pa-234m, Pa-234
    Pa-230 Ac-226, Th-226, Fr-222, Ra-222, Rn-218, Po-214
    U-230 Th-226, Ra-222, Rn-218, Po-214
    U-235 Th-231
    Pu-241 U-237
    Pu-244 U-240, Np-240m
    Am-242m Am-242, Np-238
    Am-243 Np-239
    Cm-247 Pu-243
    Bk-249 Am-245
    Cf-253 Cm-249

    b The values of A1 and A2 in Curies (Ci) are approximate and for information only; the regulatory standard units are Terabecquerels (TBq) (see Appendix A to Part 71 - Determination of A1 and A2, Section I).

    c The activity of Ir-192 in special form may be determined from a measurement of the rate of decay or a measurement of the radiation level at a prescribed distance from the source.

    d These values apply only to compounds of uranium that take the chemical form of UF6, UO2F2 and UO2(NO3)2 in both normal and accident conditions of transport.

    e These values apply only to compounds of uranium that take the chemical form of UO3, UF4, UCl4 and hexavalent compounds in both normal and accident conditions of transport.

    f These values apply to all compounds of uranium other than those specified in notes (d) and (e) of this table.

    g These values apply to unirradiated uranium only.

    h A2 = 0.74 TBq (20 Ci) for Mo-99 for domestic use.

    Table A-2 - Exempt Material Activity Concentrations and Exempt Consignment Activity Limits for Radionuclides

    Symbol of
    radionuclide     		Element and atomic number Activity concentration for exempt material
    (Bq/g)     		Activity concentration for exempt material
    (Ci/g)     		Activity limit for exempt consignment
    (Bq)     		Activity limit for exempt consignment
    (Ci)
    Ac-225 Actinium (89) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Ac-227 1.0 × 10−1 2.7 × 10−12 1.0 × 103 2.7 × 10−8
    Ac-228 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ag-105 Silver (47) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ag-108m (b) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ag-110m 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ag-111 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Al-26 Aluminum (13) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Am-241 Americium (95) 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Am-242m (b) 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Am-243 (b) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Ar-37 Argon (18) 1.0 × 106 2.7 × 10−5 1.0 × 108 2.7 × 10−3
    Ar-39 1.0 × 107 2.7 × 10−4 1.0 × 104 2.7 × 10−7
    Ar-41 1.0 × 102 2.7 × 10−9 1.0 × 109 2.7 × 10−2
    As-72 Arsenic (33) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    As-73 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    As-74 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    As-76 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    As-77 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    At-211 Astatine (85) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Au-193 Gold (79) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Au-194 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Au-195 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Au-198 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Au-199 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ba-131 Barium (56) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ba-133 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ba-133m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ba-140 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Be-7 Beryllium (4) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Be-10 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Bi-205 Bismuth (83) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Bi-206 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Bi-207 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Bi-210 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Bi-210m 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Bi-212 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Bk-247 Berkelium (97) 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Bk-249 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Br-76 Bromine (35) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Br-77 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Br-82 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    C-11 Carbon (6) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    C-14 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Ca-41 Calcium (20) 1.0 × 105 2.7 × 10−6 1.0 × 107 2.7 × 10−4
    Ca-45 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Ca-47 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Cd-109 Cadmium (48) 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Cd-113m 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Cd-115 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Cd-115m 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Ce-139 Cerium (58) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ce-141 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Ce-143 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ce-144 (b) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Cf-248 Californium (98) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cf-249 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Cf-250 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cf-251 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Cf-252 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cf-253 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Cf-254 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Cl-36 Chlorine (17) 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Cl-38 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Cm-240 Curium (96) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Cm-241 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Cm-242 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Cm-243 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Cm-244 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cm-245 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Cm-246 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Cm-247 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Cm-248 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Co-55 Cobalt (27) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Co-56 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Co-57 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Co-58 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Co-58m 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Co-60 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Cr-51 Chromium (24) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Cs-129 Cesium (55) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Cs-131 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Cs-132 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Cs-134 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cs-134m 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Cs-135 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Cs-136 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Cs-137 (b) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Cu-64 Copper (29) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Cu-67 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Dy-159 Dysprosium (66) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Dy-165 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Dy-166 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Er-169 Erbium (68) 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Er-171 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Eu-147 Europium (63) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Eu-148 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Eu-149 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Eu-150 (short lived) 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Eu-150 (long lived) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Eu-152 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Eu-152m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Eu-154 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Eu-155 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Eu-156 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    F-18 Fluorine (9) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Fe-52 Iron (26) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Fe-55 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Fe-59 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Fe-60 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Ga-67 Gallium (31) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ga-68 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Ga-72 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Gd-146 Gadolinium (64) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Gd-148 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Gd-153 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Gd-159 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Ge-68 Germanium (32) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Ge-71 1.0 × 104 2.7 × 10−7 1.0 × 108 2.7 × 10−3
    Ge-77 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Hf-172 Hafnium (72) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Hf-175 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Hf-181 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Hf-182 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Hg-194 Mercury (80) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Hg-195m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Hg-197 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Hg-197m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Hg-203 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Ho-166 Holmium (67) 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Ho-166m 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    I-123 Iodine (53) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    I-124 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    I-125 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    I-126 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    I-129 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    I-131 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    I-132 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    I-133 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    I-134 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    I-135 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    In-111 Indium (49) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    In-113m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    In-114m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    In-115m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ir-189 Iridium (77) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Ir-190 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ir-192 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Ir-194 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    K-40 Potassium (19) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    K-42 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    K-43 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Kr-79 Krypton (36) 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Kr-81 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Kr-85 1.0 × 105 2.7 × 10−6 1.0 × 104 2.7 × 10−7
    Kr-85m 1.0 × 103 2.7 × 10−8 1.0 × 1010 2.7 × 10−1
    Kr-87 1.0 × 102 2.7 × 10−9 1.0 × 109 2.7 × 10−2
    La-137 Lanthanum (57) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    La-140 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Lu-172 Lutetium (71) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Lu-173 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Lu-174 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Lu-174m 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Lu-177 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Mg-28 Magnesium (12) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Mn-52 Manganese (25) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Mn-53 1.0 × 104 2.7 × 10−7 1.0 × 109 2.7 × 10−2
    Mn-54 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Mn-56 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Mo-93 Molybdenum (42) 1.0 × 103 2.7 × 10−8 1.0 × 108 2.7 × 10−3
    Mo-99 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    N-13 Nitrogen (7) 1.0 × 102 2.7 × 10−9 1.0 × 109 2.7 × 10−2
    Na-22 Sodium (11) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Na-24 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Nb-93m Niobium (41) 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Nb-94 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Nb-95 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Nb-97 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Nd-147 Neodymium (60) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Nd-149 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ni-59 Nickel (28) 1.0 × 104 2.7 × 10−7 1.0 × 108 2.7 × 10−3
    Ni-63 1.0 × 105 2.7 × 10−6 1.0 × 108 2.7 × 10−3
    Ni-65 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Np-235 Neptunium (93) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Np-236 (short-lived) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Np-236 (long-lived) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Np-237 (b) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Np-239 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Os-185 Osmium (76) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Os-191 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Os-191m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Os-193 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Os-194 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    P-32 Phosphorus (15) 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    P-33 1.0 × 105 2.7 × 10−6 1.0 × 108 2.7 × 10−3
    Pa-230 Protactinium (91) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Pa-231 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Pa-233 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Pb-201 Lead (82) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Pb-202 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Pb-203 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Pb-205 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Pb-210 (b) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Pb-212 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Pd-103 Palladium (46) 1.0 × 103 2.7 × 10−8 1.0 × 108 2.7 × 10−3
    Pd-107 1.0 × 105 2.7 × 10−6 1.0 × 108 2.7 × 10−3
    Pd-109 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Pm-143 Promethium (61) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Pm-144 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Pm-145 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Pm-147 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Pm-148m 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Pm-149 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Pm-151 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Po-210 Polonium (84) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Pr-142 Praseodymium (59) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Pr-143 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Pt-188 Platinum (78) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Pt-191 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Pt-193 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Pt-193m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Pt-195m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Pt-197 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Pt-197m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Pu-236 Plutonium (94) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Pu-237 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Pu-238 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Pu-239 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Pu-240 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Pu-241 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Pu-242 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Pu-244 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Ra-223 (b) Radium (88) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Ra-224 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Ra-225 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Ra-226 (b) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Ra-228 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Rb-81 Rubidium (37) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Rb-83 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Rb-84 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Rb-86 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Rb-87 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Rb(nat) 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Re-184 Rhenium (75) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Re-184m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Re-186 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Re-187 1.0 × 106 2.7 × 10−5 1.0 × 109 2.7 × 10−2
    Re-188 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Re-189 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Re(nat) 1.0 × 106 2.7 × 10−5 1.0 × 109 2.7 × 10−2
    Rh-99 Rhodium (45) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Rh-101 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Rh-102 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Rh-102m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Rh-103m 1.0 × 104 2.7 × 10−7 1.0 × 108 2.7 × 10−3
    Rh-105 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Rn-222 (b) Radon (86) 1.0 × 101 2.7 × 10−10 1.0 × 108 2.7 × 10−3
    Ru-97 Ruthenium (44) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Ru-103 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Ru-105 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ru-106 (b) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    S-35 Sulphur (16) 1.0 × 105 2.7 × 10−6 1.0 × 108 2.7 × 10−3
    Sb-122 Antimony (51) 1.0 × 102 2.7 × 10−9 1.0 × 104 2.7 × 10−7
    Sb-124 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Sb-125 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sb-126 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Sc-44 Scandium (21) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Sc-46 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Sc-47 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sc-48 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Se-75 Selenium (34) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Se-79 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Si-31 Silicon (14) 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Si-32 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Sm-145 Samarium (62) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Sm-147 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Sm-151 1.0 × 104 2.7 × 10−7 1.0 × 108 2.7 × 10−3
    Sm-153 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sn-113 Tin (50) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Sn-117m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sn-119m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Sn-121m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Sn-123 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Sn-125 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Sn-126 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Sr-82 Strontium (38) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Sr-85 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sr-85m 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Sr-87m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Sr-89 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Sr-90 (b) 1.0 × 102 2.7 × 10−9 1.0 × 104 2.7 × 10−7
    Sr-91 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Sr-92 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    T(H-3) Tritium (1) 1.0 × 106 2.7 × 10−5 1.0 × 109 2.7 × 10−2
    Ta-178 (long-lived) Tantalum (73) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Ta-179 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Ta-182 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Tb-157 Terbium (65) 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Tb-158 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tb-160 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tc-95m Technetium (43) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tc-96 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tc-96m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Tc-97 1.0 × 103 2.7 × 10−8 1.0 × 108 2.7 × 10−3
    Tc-97m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Tc-98 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tc-99 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    Tc-99m 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Te-121 Tellurium (52) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Te-121m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Te-123m 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Te-125m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Te-127 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Te-127m 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Te-129 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Te-129m 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Te-131m 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Te-132 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Th-227 Thorium (90) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Th-228 (b) 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Th-229 (b) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Th-230 1.0 2.7 × 10−11 1.0 × 104 2.7 × 10−7
    Th-231 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Th-232 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    Th-234 (b) 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Th (nat) (b) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    Ti-44 Titanium (22) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    Tl-200 Thallium (81) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Tl-201 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Tl-202 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Tl-204 1.0 × 104 2.7 × 10−7 1.0 × 104 2.7 × 10−7
    Tm-167 Thulium (69) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Tm-170 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Tm-171 1.0 × 104 2.7 × 10−7 1.0 × 108 2.7 × 10−3
    U-230 (fast lung absorption) (b),(d) Uranium (92) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    U-230 (medium lung absorption) (e) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-230 (slow lung absorption) (f) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-232 (fast lung absorption) (b),(d) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    U-232 (medium lung absorption) (e) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-232 (slow lung absorption) (f) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-233 (fast lung absorption) (d) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-233 (medium lung absorption) (e) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    U-233 (slow lung absorption) (f) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    U-234 (fast lung absorption) (d) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-234 (medium lung absorption) (e) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    U-234 (slow lung absorption) (f) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    U-235 (all lung absorption types) (b),(d),(e),(f) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-236 (fast lung absorption) (d) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-236 (medium lung absorption) (e) 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    U-236 (slow lung absorption) (f) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U-238 (all lung absorption types) (b),(d),(e),(f) 1.0 × 101 2.7 × 10−10 1.0 × 104 2.7 × 10−7
    U (nat) (b) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    U (enriched to 20% or less)(g) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    U (dep) 1.0 2.7 × 10−11 1.0 × 103 2.7 × 10−8
    V-48 Vanadium (23) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6
    V-49 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    W-178 Tungsten (74) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    W-181 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    W-185 1.0 × 104 2.7 × 10−7 1.0 × 107 2.7 × 10−4
    W-187 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    W-188 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Xe-122 Xenon (54) 1.0 × 102 2.7 × 10−9 1.0 × 109 2.7 × 10−2
    Xe-123 1.0 × 102 2.7 × 10−9 1.0 × 109 2.7 × 10−2
    Xe-127 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Xe-131m 1.0 × 104 2.7 × 10−7 1.0 × 104 2.7 × 10−7
    Xe-133 1.0 × 103 2.7 × 10−8 1.0 × 104 2.7 × 10−7
    Xe-135 1.0 × 103 2.7 × 10−8 1.0 × 1010 2.7 × 10−1
    Y-87 Yttrium (39) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Y-88 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Y-90 1.0 × 103 2.7 × 10−8 1.0 × 105 2.7 × 10−6
    Y-91 1.0 × 103 2.7 × 10−8 1.0 × 106 2.7 × 10−5
    Y-91m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Y-92 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Y-93 1.0 × 102 2.7 × 10−9 1.0 × 105 2.7 × 10−6
    Yb-169 Ytterbium (70) 1.0 × 102 2.7 × 10−9 1.0 × 107 2.7 × 10−4
    Yb-175 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Zn-65 Zinc (30) 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Zn-69 1.0 × 104 2.7 × 10−7 1.0 × 106 2.7 × 10−5
    Zn-69m 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Zr-88 Zirconium (40) 1.0 × 102 2.7 × 10−9 1.0 × 106 2.7 × 10−5
    Zr-93 (b) 1.0 × 103 2.7 × 10−8 1.0 × 107 2.7 × 10−4
    Zr-95 1.0 × 101 2.7 × 10−10 1.0 × 106 2.7 × 10−5
    Zr-97 (b) 1.0 × 101 2.7 × 10−10 1.0 × 105 2.7 × 10−6

    a [Reserved]

    b Parent nuclides and their progeny included in secular equilibrium are listed as follows:

    Sr-90 Y-90
    Zr-93 Nb-93m
    Zr-97 Nb-97
    Ru-106 Rh-106
    Ag-108m Ag-108
    Cs-137 Ba-137m
    Ce-144 Pr-144
    Ba-140 La-140
    Bi-212 Tl-208 (0.36), Po-212 (0.64)
    Pb-210 Bi-210, Po-210
    Pb-212 Bi-212, Tl-208 (0.36), Po-212 (0.64)
    Rn-222 Po-218, Pb-214, Bi-214, Po-214
    Ra-223 Rn-219, Po-215, Pb-211, Bi-211, Tl-207
    Ra-224 Rn-220, Po-216, Pb-212, Bi-212, Tl-208 (0.36), Po-212 (0.64)
    Ra-226 Rn-222, Po-218, Pb-214, Bi-214, Po-214, Pb-210, Bi-210, Po-210
    Ra-228 Ac-228
    Th-228 Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208 (0.36), Po-212(0.64)
    Th-229 Ra-225, Ac-225, Fr-221, At-217, Bi-213, Po-213, Pb-209
    Th-nat Ra-228, Ac-228, Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208 (0.36), Po-212 (0.64)
    Th-234 Pa-234m
    U-230 Th-226, Ra-222, Rn-218, Po-214
    U-232 Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208 (0.36), Po-212 (0.64)
    U-235 Th-231
    U-238 Th-234, Pa-234m
    U-nat Th-234, Pa-234m, U-234, Th-230, Ra-226, Rn-222, Po-218, Pb-214, Bi-214, Po-214, Pb-210, Bi-210, Po-210
    Np-237 Pa-233
    Am-242m Am-242
    Am-243 Np-239

    c [Reserved]

    d These values apply only to compounds of uranium that take the chemical form of UF6, UO2F2 and UO2(NO3)2 in both normal and accident conditions of transport.

    e These values apply only to compounds of uranium that take the chemical form of UO3, UF4, UCl4 and hexavalent compounds in both normal and accident conditions of transport.

    f These values apply to all compounds of uranium other than those specified in notes (d) and (e) of this table.

    g These values apply to unirradiated uranium only.

    Table A-3 - General Values for A1 and A2

    Contents A1 A2 Activity concentration for exempt material
    (Bq/g)     		Activity concentration for exempt material
    (Ci/g)     		Activity limits for exempt consignments
    (Bq)     		Activity limits for exempt consignments
    (Ci)
    (TBq) (Ci) (TBq) (Ci)
    Only beta or gamma emitting radionuclides are known to be present 1 × 10−1 2.7 × 100 2 × 10−2 5.4 × 10−1 1 × 101 2.7 × 10−10 1 × 104 2.7 × 10−7
    Alpha emitting nuclides, but no neutron emitters, are known to be present (a) 2 × 10−1 5.4 × 100 9 × 10−5 2.4 × 10−3 1 × 10−1 2.7 × 10−12 1 × 103 2.7 × 10−8
    Neutron emitting nuclides are known to be present or no relevant data are available 1 × 10−3 2.7 × 10−2 9 × 10−5 2.4 × 10−3 1 × 10−1 2.7 × 10−12 1 × 103 2.7 × 10−8

    a If beta or gamma emitting nuclides are known to be present, the A1 value of 0.1 TBq (2.7 Ci) should be used.

    Table A-4 - Activity-mass Relationships for Uranium

    Uranium Enrichment1 wt % U-235 present Specific Activity
    TBq/g Ci/g
    0.45 1.8 × 10−8 5.0 × 10−7
    0.72 2.6 × 10−8 7.1 × 10−7
    1 2.8 × 10−8 7.6 × 10−7
    1.5 3.7 × 10−8 1.0 × 10−6
    5 1.0 × 10−7 2.7 × 10−6
    10 1.8 × 10−7 4.8 × 10−6
    20 3.7 × 10−7 1.0 × 10−5
    35 7.4 × 10−7 2.0 × 10−5
    50 9.3 × 10−7 2.5 × 10−5
    90 2.2 × 10−6 5.8 × 10−5
    93 2.6 × 10−6 7.0 × 10−5
    95 3.4 × 10−6 9.1 × 10−5

    1 The figures for uranium include representative values for the activity of the uranium-234 that is concentrated during the enrichment process.

    [69 FR 3800, Jan. 26, 2004; 69 FR 58039, Sept. 29, 2004, as amended at 77 FR 39908, July 6, 2012; 80 FR 34014, June 12, 2015; 85 FR 65663, Oct. 16, 2020]