§ 173.435 - Table of A1 and A2 values for radionuclides.

§ 173.435 Table of A₁ and A₂ values for radionuclides.

Cross Reference

Link to an amendment published at 85 FR 83401, Dec. 21, 2020.

Cross Reference

The

effective date of this amendment was corrected to read January 21, 2021, at 86 FR 2504, Jan. 13, 2021.

The table of A₁ and A₂ values for radionuclides is as follows:

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 × 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	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	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 × 100	1.1 × 102	2.0 × 100	5.4 × 101	4.2 × 104	1.1 × 106
Kr-81	Krypton (36)	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-99(a)(i)		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 × 10 6 −10	1.8 × 10 −8
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 § 173.434	see § 173.434
U (dep)		Unlimited	Unlimited	Unlimited	Unlimited	see § 173.434	see § 173.434
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

^aA₁ and/or A₂ values for these parent radionuclides include contributions from daughter nuclides with half-lives less than 10 days as listed in footnote (a) to Table 2 in the “IAEA Regulations for the Safe Transport of Radioactive Material, SSR-6” (IBR, see § 171.7 of this subchapter).

^b The values of A₁ and A₂ in curies (Ci) are approximate and for information only; the regulatory standard units are Terabecquerels (TBq), (see § 171.10).

^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 [Reserved]

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

[69 FR 3678, Jan. 26, 2004; 69 FR 55119, Sept. 13, 2004, as amended at 71 FR 54395, Sept. 14, 2006; 77 FR 60942, Oct. 5, 2012; 79 FR 40615, July 11, 2014; 80 FR 1163, Jan. 8, 2015; 85 FR 83401, Dec. 21, 2020]