U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 24, 2020

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

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 × 10−12.2 × 10 16.0 × 10−31.6 × 10−12.1 × 10 35.8 × 10 4
Ac-227 (a) 9.0 × 10−12.4 × 10 19.0 × 10−52.4 × 10−32.77.2 × 10 1
Ac-228 6.0 × 10−11.6 × 10 15.0 × 10−11.4 × 10 18.4 × 10 42.2 × 10 6
Ag-105Silver (47)2.05.4 × 10 12.05.4 × 10 11.1 × 10 33.0 × 10 4
Ag-108m (a) 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 19.7 × 10−12.6 × 10 1
Ag-110m (a) 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 11.8 × 10 24.7 × 10 3
Ag-111 2.05.4 × 10 16.0 × 10−11.6 × 10 15.8 × 10 31.6 × 10 5
Al-26Aluminum (13)1.0 × 10−12.71.0 × 10−12.77.0 × 10−41.9 × 10−2
Am-241Americium (95)1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−21.3 × 10−13.4
Am-242m (a) 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−23.6 × 10−11.0 × 10 1
Am-243 (a) 5.01.4 × 10 21.0 × 10−32.7 × 10−27.4 × 10−32.0 × 10−1
Ar-37Argon (18)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 33.7 × 10 39.9 × 10 4
Ar-39 4.0 × 10 11.1 × 10 32.0 × 10 15.4 × 10 21.33.4 × 10 1
Ar-41 3.0 × 10−18.13.0 × 10−18.11.5 × 10 64.2 × 10 7
As-72Arsenic (33)3.0 × 10−18.13.0 × 10−18.16.2 × 10 41.7 × 10 6
As-73 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 38.2 × 10 22.2 × 10 4
As-74 1.02.7 × 10 19.0 × 10−12.4 × 10 13.7 × 10 39.9 × 10 4
As-76 3.0 × 10−18.13.0 × 10−18.15.8 × 10 41.6 × 10 6
As-77 2.0 × 10 15.4 × 10 27.0 × 10−11.9 × 10 13.9 × 10 41.0 × 10 6
At-211 (a)Astatine (85)2.0 × 10 15.4 × 10 25.0 × 10−11.4 × 10 17.6 × 10 42.1 × 10 6
Au-193Gold (79)7.01.9 × 10 22.05.4 × 10 13.4 × 10 49.2 × 10 5
Au-194 1.02.7 × 10 11.02.7 × 10 11.5 × 10 44.1 × 10 5
Au-195 1.0 × 10 12.7 × 10 26.01.6 × 10 21.4 × 10 23.7 × 10 3
Au-198 1.02.7 × 10 16.0 × 10−11.6 × 10 19.0 × 10 32.4 × 10 5
Au-199 1.0 × 10 12.7 × 10 26.0 × 10−11.6 × 10 17.7 × 10 32.1 × 10 5
Ba-131 (a)Barium (56)2.05.4 × 10 12.05.4 × 10 13.1 × 10 38.4 × 10 4
Ba-133 3.08.1 × 10 13.08.1 × 10 19.42.6 × 10 2
Ba-133m 2.0 × 10 15.4 × 10 26.0 × 10−11.6 × 10 12.2 × 10 46.1 × 10 5
Ba-140 (a) 5.0 × 10−11.4 × 10 13.0 × 10−18.12.7 × 10 37.3 × 10 4
Be-7Beryllium (4)2.0 × 10 15.4 × 10 22.0 × 10 15.4 × 10 21.3 × 10 43.5 × 10 5
Be-10 4.0 × 10 11.1 × 10 36.0 × 10−11.6 × 10 18.3 × 10−42.2 × 10−2
Bi-205Bismuth (83)7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 11.5 × 10 34.2 × 10 4
Bi-206 3.0 × 10−18.13.0 × 10−18.13.8 × 10 31.0 × 10 5
Bi-207 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 11.95.2 × 10 1
Bi-210 1.02.7 × 10 16.0 × 10−11.6 × 10 14.6 × 10 31.2 × 10 5
Bi-210m (a) 6.0 × 10−11.6 × 10 12.0 × 10−25.4 × 10−12.1 × 10−55.7 × 10−4
Bi-212 (a) 7.0 × 10−11.9 × 10 16.0 × 10−11.6 × 10 15.4 × 10 51.5 × 10 7
Bk-247Berkelium (97)8.02.2 × 10 28.0 × 10−42.2 × 10−23.8 × 10−21.0
Bk-249 (a) 4.0 × 10 11.1 × 10 33.0 × 10−18.16.1 × 10 11.6 × 10 3
Br-76Bromine (35)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 19.4 × 10 42.5 × 10 6
Br-77 3.08.1 × 10 13.08.1 × 10 12.6 × 10 47.1 × 10 5
Br-82 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 14.0 × 10 41.1 × 10 6
C-11Carbon (6)1.02.7 × 10 16.0 × 10−11.6 × 10 13.1 × 10 78.4 × 10 8
C-14 4.0 × 10 11.1 × 10 33.08.1 × 10 11.6 × 10−14.5
Ca-41Calcium (20)UnlimitedUnlimitedUnlimitedUnlimited3.1 × 10−38.5 × 10−2
Ca-45 4.0 × 10 11.1 × 10 31.02.7 × 10 16.6 × 10 21.8 × 10 4
Ca-47 (a) 3.08.1 × 10 13.0 × 10−18.12.3 × 10 46.1 × 10 5
Cd-109Cadmium (48)3.0 × 10 18.1 × 10 22.05.4 × 10 19.6 × 10 12.6 × 10 3
Cd-113m 4.0 × 10 11.1 × 10 35.0 × 10−11.4 × 10 18.32.2 × 10 2
Cd-115 (a) 3.08.1 × 10 14.0 × 10−11.1 × 10 11.9 × 10 45.1 × 10 5
Cd-115m 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 19.4 × 10 22.5 × 10 4
Ce-139Cerium (58)7.01.9 × 10 22.05.4 × 10 12.5 × 10 26.8 × 10 3
Ce-141 2.0 × 10 15.4 × 10 26.0 × 10−11.6 × 10 11.1 × 10 32.8 × 10 4
Ce-143 9.0 × 10−12.4 × 10 16.0 × 10−11.6 × 10 12.5 × 10 46.6 × 10 5
Ce-144 (a) 2.0 × 10−15.42.0 × 10−15.41.2 × 10 23.2 × 10 3
Cf-248Californium (98)4.0 × 10 11.1 × 10 36.0 × 10−31.6 × 10−15.8 × 10 11.6 × 10 3
Cf-249 3.08.1 × 10 18.0 × 10−42.2 × 10−21.5 × 10−14.1
Cf-250 2.0 × 10 15.4 × 10 22.0 × 10−35.4 × 10−24.01.1 × 10 2
Cf-251 7.01.9 × 10 27.0 × 10−41.9 × 10−25.9 × 10−21.6
Cf-252 1 × 10−12.73.0 × 10−38.1 × 10−22.0 × 10 15.4 × 10 2
Cf-253 (a) 4.0 × 10 11.1 × 10 34.0 × 10−21.11.1 × 10 32.9 × 10 4
Cf-254 1.0 × 10−32.7 × 10−21.0 × 10−32.7 × 10−23.1 × 10 28.5 × 10 3
Cl-36Chlorine (17)1.0 × 10 12.7 × 10 26.0 × 10−11.6 × 10 11.2 × 10−33.3 × 10−2
Cl-38 2.0 × 10−15.42.0 × 10−15.44.9 × 10 61.3 × 10 8
Cm-240Curium (96)4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−17.5 × 10 22.0 × 10 4
Cm-241 2.05.4 × 10 11.02.7 × 10 16.1 × 10 21.7 × 10 4
Cm-242 4.0 × 10 11.1 × 10 31.0 × 10−22.7 × 10−11.2 × 10 23.3 × 10 3
Cm-243 9.02.4 × 10 21.0 × 10−32.7 × 10−21.95.2 × 10 1
Cm-244 2.0 × 10 15.4 × 10 22.0 × 10−35.4 × 10−23.08.1 × 10 1
Cm-245 9.02.4 × 10 29.0 × 10−42.4 × 10−26.4 × 10−31.7 × 10−1
Cm-246 9.02.4 × 10 29.0 × 10−42.4 × 10−21.1 × 10−23.1 × 10−1
Cm-247 (a) 3.08.1 × 10 11.0 × 10−32.7 × 10−23.4 × 10−69.3 × 10−5
Cm-248 2.0 × 10−25.4 × 10−13.0 × 10−48.1 × 10−31.6 × 10−44.2 × 10−3
Co-55Cobalt (27)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 11.1 × 10 53.1 × 10 6
Co-56 3.0 × 10−18.13.0 × 10−18.11.1 × 10 33.0 × 10 4
Co-57 1.0 × 10 12.7 × 10 21.0 × 10 12.7 × 10 23.1 × 10 28.4 × 10 3
Co-58 1.02.7 × 10 11.02.7 × 10 11.2 × 10 33.2 × 10 4
Co-58m 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 32.2 × 10 55.9 × 10 6
Co-60 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 14.2 × 10 11.1 × 10 3
Cr-51Chromium (24)3.0 × 10 18.1 × 10 23.0 × 10 18.1 × 10 23.4 × 10 39.2 × 10 4
Cs-129Cesium (55)4.01.1 × 10 24.01.1 × 10 22.8 × 10 47.6 × 10 5
Cs-131 3.0 × 10 18.1 × 10 23.0 × 10 18.1 × 10 23.8 × 10 31.0 × 10 5
Cs-132 1.02.7 × 10 11.02.7 × 10 15.7 × 10 31.5 × 10 5
Cs-134 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 14.8 × 10 11.3 × 10 3
Cs-134m 4.0 × 10 11.1 × 10 36.0 × 10−11.6 × 10 13.0 × 10 58.0 × 10 6
Cs-135 4.0 × 10 11.1 × 10 31.02.7 × 10 14.3 × 10−51.2 × 10−3
Cs-136 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 12.7 × 10 37.3 × 10 4
Cs-137 (a) 2.05.4 × 10 16.0 × 10−11.6 × 10 13.28.7 × 10 1
Cu-64Copper (29)6.01.6 × 10 21.02.7 × 10 11.4 × 10 53.9 × 10 6
Cu-67 1.0 × 10 12.7 × 10 27.0 × 10−11.9 × 10 12.8 × 10 47.6 × 10 5
Dy-159Dysprosium (66)2.0 × 10 15.4 × 10 22.0 × 10 15.4 × 10 22.1 × 10 25.7 × 10 3
Dy-165 9.0 × 10−12.4 × 10 16.0 × 10−11.6 × 10 13.0 × 10 58.2 × 10 6
Dy-166 (a) 9.0 × 10−12.4 × 10 13.0 × 10−18.18.6 × 10 32.3 × 10 5
Er-169Erbium (68)4.0 × 10 11.1 × 10 31.02.7 × 10 13.1 × 10 38.3 × 10 4
Er-171 8.0 × 10−12.2 × 10 15.0 × 10−11.4 × 10 19.0 × 10 42.4 × 10 6
Eu-147Europium (63)2.05.4 × 10 12.05.4 × 10 11.4 × 10 33.7 × 10 4
Eu-148 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 16.0 × 10 21.6 × 10 4
Eu-149 2.0 × 10 15.4 × 10 22.0 × 10 15.4 × 10 23.5 × 10 29.4 × 10 3
Eu-150 (short lived) 2.05.4 × 10 17.0 × 10−11.9 × 10 16.1 × 10 41.6 × 10 6
Eu-150 (long lived) 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 16.1 × 10 41.6 × 10 6
Eu-152 1.02.7 × 10 11.02.7 × 10 16.51.8 × 10 2
Eu-152m 8.0 × 10−12.2 × 10 18.0 × 10−12.2 × 10 18.2 × 10 42.2 × 10 6
Eu-154 9.0 × 10−12.4 × 10 16.0 × 10−11.6 × 10 19.82.6 × 10 2
Eu-155 2.0 × 10 15.4 × 10 23.08.1 × 10 11.8 × 10 14.9 × 10 2
Eu-156 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 12.0 × 10 35.5 × 10 4
F-18Fluorine (9)1.02.7 × 10 16.0 × 10−11.6 × 10 13.5 × 10 69.5 × 10 7
Fe-52 (a)Iron (26)3.0 × 10−18.13.0 × 10−18.12.7 × 10 57.3 × 10 6
Fe-55 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 38.8 × 10 12.4 × 10 3
Fe-59 9.0 × 10−12.4 × 10 19.0 × 10−12.4 × 10 11.8 × 10 35.0 × 10 4
Fe-60 (a) 4.0 × 10 11.1 × 10 32.0 × 10−15.47.4 × 10−42.0 × 10−2
Ga-67Gallium (31)7.01.9 × 10 23.08.1 × 10 12.2 × 10 46.0 × 10 5
Ga-68 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 11.5 × 10 64.1 × 10 7
Ga-72 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 11.1 × 10 53.1 × 10 6
Gd-146 (a)Gadolinium (64)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 16.9 × 10 21.9 × 10 4
Gd-148 2.0 × 10 15.4 × 10 22.0 × 10−35.4 × 10−21.23.2 × 10 1
Gd-153 1.0 × 10 12.7 × 10 29.02.4 × 10 21.3 × 10 23.5 × 10 3
Gd-159 3.08.1 × 10 16.0 × 10−11.6 × 10 13.9 × 10 41.1 × 10 6
Ge-68 (a)Germanium (32)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 12.6 × 10 27.1 × 10 3
Ge-71 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 35.8 × 10 31.6 × 10 5
Ge-77 3.0 × 10−18.13.0 × 10−18.11.3 × 10 53.6 × 10 6
Hf-172 (a)Hafnium (72)6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 14.1 × 10 11.1 × 10 3
Hf-175 3.08.1 × 10 13.08.1 × 10 13.9 × 10 21.1 × 10 4
Hf-181 2.05.4 × 10 15.0 × 10−11.4 × 10 16.3 × 10 21.7 × 10 4
Hf-182 UnlimitedUnlimitedUnlimitedUnlimited8.1 × 10−62.2 × 10−4
Hg-194 (a)Mercury (80)1.02.7 × 10 11.02.7 × 10 11.3 × 10−13.5
Hg-195m (a) 3.08.1 × 10 17.0 × 10−11.9 × 10 11.5 × 10 44.0 × 10 5
Hg-197 2.0 × 10 15.4 × 10 21.0 × 10 12.7 × 10 29.2 × 10 32.5 × 10 5
Hg-197m 1.0 × 10 12.7 × 10 24.0 × 10−11.1 × 10 12.5 × 10 46.7 × 10 5
Hg-203 5.01.4 × 10 21.02.7 × 10 15.1 × 10 21.4 × 10 4
Ho-166Holmium (67)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 12.6 × 10 47.0 × 10 5
Ho-166m 6.0 × 10−11.6 × 10 15.0 × 10−11.4 × 10 16.6 × 10−21.8
I-123Iodine (53)6.01.6 × 10 23.08.1 × 10 17.1 × 10 41.9 × 10 6
I-124 1.02.7 × 10 11.02.7 × 10 19.3 × 10 32.5 × 10 5
I-125 2.0 × 10 15.4 × 10 23.08.1 × 10 16.4 × 10 21.7 × 10 4
I-126 2.05.4 × 10 11.02.7 × 10 12.9 × 10 38.0 × 10 4
I-129 UnlimitedUnlimitedUnlimitedUnlimited6.5 × 10−61.8 × 10−4
I-131 3.08.1 × 10 17.0 × 10−11.9 × 10 14.6 × 10 31.2 × 10 5
I-132 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 13.8 × 10 51.0 × 10 7
I-133 7.0 × 10−11.9 × 10 16.0 × 10−11.6 × 10 14.2 × 10 41.1 × 10 6
I-134 3.0 × 10−18.13.0 × 10−18.19.9 × 10 52.7 × 10 7
I-135 (a) 6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 11.3 × 10 53.5 × 10 6
In-111Indium (49)3.08.1 × 10 13.08.1 × 10 11.5 × 10 44.2 × 10 5
In-113m 4.01.1 × 10 22.05.4 × 10 16.2 × 10 51.7 × 10 7
In-114m (a) 1.0 × 10 12.7 × 10 25.0 × 10−11.4 × 10 18.6 × 10 22.3 × 10 4
In-115m 7.01.9 × 10 21.02.7 × 10 12.2 × 10 56.1 × 10 6
Ir-189 (a)Iridium (77)1.0 × 10 12.7 × 10 21.0 × 10 12.7 × 10 21.9 × 10 35.2 × 10 4
Ir-190 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 12.3 × 10 36.2 × 10 4
Ir-192 (c) 1.02.7 × 10 16.0 × 10−11.6 × 10 13.4 × 10 29.2 × 10 3
Ir-194 3.0 × 10−18.13.0 × 10−18.13.1 × 10 48.4 × 10 5
K-40Potassium (19)9.0 × 10−12.4 × 10 19.0 × 10−12.4 × 10 12.4 × 10−76.4 × 10−6
K-42 2.0 × 10−15.42.0 × 10−15.42.2 × 10 56.0 × 10 6
K-43 7.0 × 10−11.9 × 10 16.0 × 10−11.6 × 10 11.2 × 10 53.3 × 10 6
Kr-79Krypton (36)4.0 × 10 01.1 × 10 22.0 × 10 05.4 × 10 14.2 × 10 41.1 × 10 6
Kr-81Krypton (36)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 37.8 × 10−42.1 × 10−2
Kr-85 1.0 × 10 12.7 × 10 21.0 × 10 12.7 × 10 21.5 × 10 13.9 × 10 2
Kr-85m 8.02.2 × 10 23.08.1 × 10 13.0 × 10 58.2 × 10 6
Kr-87 2.0 × 10−15.42.0 × 10−15.41.0 × 10 62.8 × 10 7
La-137Lanthanum (57)3.0 × 10 18.1 × 10 26.01.6 × 10 21.6 × 10−34.4 × 10−2
La-140 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 12.1 × 10 45.6 × 10 5
Lu-172Lutetium (71)6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 14.2 × 10 31.1 × 10 5
Lu-173 8.02.2 × 10 28.02.2 × 10 25.6 × 10 11.5 × 10 3
Lu-174 9.02.4 × 10 29.02.4 × 10 22.3 × 10 16.2 × 10 2
Lu-174m 2.0 × 10 15.4 × 10 21.0 × 10 12.7 × 10 22.0 × 10 25.3 × 10 3
Lu-177 3.0 × 10 18.1 × 10 27.0 × 10−11.9 × 10 14.1 × 10 31.1 × 10 5
Mg-28 (a)Magnesium (12)3.0 × 10−18.13.0 × 10−18.12.0 × 10 55.4 × 10 6
Mn-52Manganese (25)3.0 × 10−18.13.0 × 10−18.11.6 × 10 44.4 × 10 5
Mn-53 UnlimitedUnlimitedUnlimitedUnlimited6.8 × 10−51.8 × 10−3
Mn-54 1.02.7 × 10 11.02.7 × 10 12.9 × 10 27.7 × 10 3
Mn-56 3.0 × 10−18.13.0 × 10−18.18.0 × 10 52.2 × 10 7
Mo-93Molybdenum (42)4.0 × 10 11.1 × 10 32.0 × 10 15.4 × 10 24.1 × 10−21.1
Mo-99(a)(i) 1.02.7 × 10 16.0 × 10−11.6 × 10 11.8 × 10 44.8 × 10 5
N-13Nitrogen (7)9.0 × 10−12.4 × 10 16.0 × 10−11.6 × 10 15.4 × 10 71.5 × 10 9
Na-22Sodium (11)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 12.3 × 10 26.3 × 10 3
Na-24 2.0 × 10−15.42.0 × 10−15.43.2 × 10 58.7 × 10 6
Nb-93mNiobium (41)4.0 × 10 11.1 × 10 33.0 × 10 18.1 × 10 28.82.4 × 10 2
Nb-94 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 16.9 × 10−31.9 × 10−1
Nb-95 1.02.7 × 10 11.02.7 × 10 11.5 × 10 33.9 × 10 4
Nb-97 9.0 × 10−12.4 × 10 16.0 × 10−11.6 × 10 19.9 × 10 52.7 × 10 7
Nd-147Neodymium (60)6.01.6 × 10 26.0 × 10−11.6 × 10 13.0 × 10 38.1 × 10 4
Nd-149 6.0 × 10−11.6 × 10 15.0 × 10−11.4 × 10 14.5 × 10 51.2 × 10 7
Ni-59Nickel (28)UnlimitedUnlimitedUnlimitedUnlimited3.0 × 10−38.0 × 10−2
Ni-63 4.0 × 10 11.1 × 10 33.0 × 10 18.1 × 10 22.15.7 × 10 1
Ni-65 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 17.1 × 10 51.9 × 10 7
Np-235Neptunium (93)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 35.2 × 10 11.4 × 10 3
Np-236 (short-lived) 2.0 × 10 15.4 × 10 22.05.4 × 10 14.7 × 10−41.3 × 10−2
Np-236 (long-lived) 9.0 × 10 02.4 × 10 22.0 × 10−25.4 × 10−14.7 × 10−41.3 × 10−2
Np-237 2.0 × 10 15.4 × 10 22.0 × 10−35.4 × 10−22.6 × 10−57.1 × 10−4
Np-239 7.01.9 × 10 24.0 × 10−11.1 × 10 18.6 × 10 32.3 × 10 5
Os-185Osmium (76)1.02.7 × 10 11.02.7 × 10 12.8 × 10 27.5 × 10 3
Os-191 1.0 × 10 12.7 × 10 22.05.4 × 10 11.6 × 10 34.4 × 10 4
Os-191m 4.0 × 10 11.1 × 10 33.0 × 10 18.1 × 10 24.6 × 10 41.3 × 10 6
Os-193 2.05.4 × 10 16.0 × 10−11.6 × 10 12.0 × 10 45.3 × 10 5
Os-194 (a) 3.0 × 10−18.13.0 × 10−18.11.1 × 10 13.1 × 10 2
P-32Phosphorus (15)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 11.1 × 10 42.9 × 10 5
P-33 4.0 × 10 11.1 × 10 31.02.7 × 10 15.8 × 10 31.6 × 10 5
Pa-230 (a)Protactinium (91)2.05.4 × 10 17.0 × 10−21.91.2 × 10 33.3 × 10 4
Pa-231 4.01.1 × 10 24.0 × 10−41.1 × 10−21.7 × 10−34.7 × 10−2
Pa-233 5.01.4 × 10 27.0 × 10−11.9 × 10 17.7 × 10 22.1 × 10 4
Pb-201Lead (82)1.02.7 × 10 11.02.7 × 10 16.2 × 10 41.7 × 10 6
Pb-202 4.0 × 10 11.1 × 10 32.0 × 10 15.4 × 10 21.2 × 10−43.4 × 10−3
Pb-203 4.01.1 × 10 23.08.1 × 10 11.1 × 10 43.0 × 10 5
Pb-205 UnlimitedUnlimitedUnlimitedUnlimited4.5 × 10−61.2 × 10−4
Pb-210 (a) 1.02.7 × 10 15.0 × 10−21.42.87.6 × 10 1
Pb-212 (a) 7.0 × 10−11.9 × 10 12.0 × 10−15.45.1 × 10 41.4 × 10 6
Pd-103 (a)Palladium (46)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 32.8 × 10 37.5 × 10 4
Pd-107 UnlimitedUnlimitedUnlimitedUnlimited1.9 × 10−55.1 × 10−4
Pd-109 2.05.4 × 10 15.0 × 10−11.4 × 10 17.9 × 10 42.1 × 10 6
Pm-143Promethium (61)3.08.1 × 10 13.08.1 × 10 11.3 × 10 23.4 × 10 3
Pm-144 7.0 × 10−11.9 × 10 17.0 × 10−11.9 × 10 19.2 × 10 12.5 × 10 3
Pm-145 3.0 × 10 18.1 × 10 21.0 × 10 12.7 × 10 25.21.4 × 10 2
Pm-147 4.0 × 10 11.1 × 10 32.05.4 × 10 13.4 × 10 19.3 × 10 2
Pm-148m (a) 8.0 × 10−12.2 × 10 17.0 × 10−11.9 × 10 17.9 × 10 22.1 × 10 4
Pm-149 2.05.4 × 10 16.0 × 10−11.6 × 10 11.5 × 10 44.0 × 10 5
Pm-151 2.05.4 × 10 16.0 × 10−11.6 × 10 12.7 × 10 47.3 × 10 5
Po-210Polonium (84)4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−11.7 × 10 24.5 × 10 3
Pr-142Praseodymium (59)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 14.3 × 10 41.2 × 10 6
Pr-143 3.08.1 × 10 16.0 × 10−11.6 × 10 12.5 × 10 36.7 × 10 4
Pt-188 (a)Platinum (78)1.02.7 × 10 18.0 × 10−12.2 × 10 12.5 × 10 36.8 × 10 4
Pt-191 4.01.1 × 10 23.08.1 × 10 18.7 × 10 32.4 × 10 5
Pt-193 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 31.43.7 × 10 1
Pt-193m 4.0 × 10 11.1 × 10 35.0 × 10−11.4 × 10 15.8 × 10 31.6 × 10 5
Pt-195m 1.0 × 10 12.7 × 10 25.0 × 10−11.4 × 10 16.2 × 10 31.7 × 10 5
Pt-197 2.0 × 10 15.4 × 10 26.0 × 10−11.6 × 10 13.2 × 10 48.7 × 10 5
Pt-197m 1.0 × 10 12.7 × 10 26.0 × 10−11.6 × 10 13.7 × 10 51.0 × 10 7
Pu-236Plutonium (94)3.0 × 10 18.1 × 10 23.0 × 10−38.1 × 10−22.0 × 10 15.3 × 10 2
Pu-237 2.0 × 10 15.4 × 10 22.0 × 10 15.4 × 10 24.5 × 10 21.2 × 10 4
Pu-238 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−26.3 × 10−11.7 × 10 1
Pu-239 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−22.3 × 10−36.2 × 10−2
Pu-240 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−28.4 × 10−32.3 × 10−1
Pu-241 (a) 4.0 × 10 11.1 × 10 36.0 × 10−21.63.81.0 × 10 2
Pu-242 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−21.5 × 10−43.9 × 10−3
Pu-244 (a) 4.0 × 10−11.1 × 10 11.0 × 10−32.7 × 10−26.7 × 10−71.8 × 10−5
Ra-223 (a)Radium (88)4.0 × 10−11.1 × 10 17.0 × 10−31.9 × 10−11.9 × 10 35.1 × 10 4
Ra-224 (a) 4.0 × 10−11.1 × 10 12.0 × 10−25.4 × 10−15.9 × 10 31.6 × 10 5
Ra-225 (a) 2.0 × 10−15.44.0 × 10−31.1 × 10−11.5 × 10 33.9 × 10 4
Ra-226 (a) 2.0 × 10−15.43.0 × 10−38.1 × 10−23.7 × 10−21.0
Ra-228 (a) 6.0 × 10−11.6 × 10 12.0 × 10−25.4 × 10−11.0 × 10 12.7 × 10 2
Rb-81Rubidium (37)2.05.4 × 10 18.0 × 10−12.2 × 10 13.1 × 10 58.4 × 10 6
Rb-83 (a) 2.05.4 × 10 12.05.4 × 10 16.8 × 10 21.8 × 10 4
Rb-84 1.02.7 × 10 11.02.7 × 10 11.8 × 10 34.7 × 10 4
Rb-86 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 13.0 × 10 38.1 × 10 4
Rb-87 UnlimitedUnlimitedUnlimitedUnlimited3.2 × 10−98.6 × 10−8
Rb(nat) UnlimitedUnlimitedUnlimitedUnlimited6.7 × 10 61.8 × 10 8
Re-184Rhenium (75)1.02.7 × 10 11.02.7 × 10 16.9 × 10 21.9 × 10 4
Re-184m 3.08.1 × 10 11.02.7 × 10 11.6 × 10 24.3 × 10 3
Re-186 2.05.4 × 10 16.0 × 10−11.6 × 10 16.9 × 10 31.9 × 10 5
Re-187 UnlimitedUnlimitedUnlimitedUnlimited1.4 × 10−93.8 × 10−8
Re-188 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 13.6 × 10 49.8 × 10 5
Re-189 (a) 3.08.1 × 10 16.0 × 10−11.6 × 10 12.5 × 10 46.8 × 10 5
Re(nat) UnlimitedUnlimitedUnlimitedUnlimited0.02.4 × 10−8
Rh-99Rhodium (45)2.05.4 × 10 12.05.4 × 10 13.0 × 10 38.2 × 10 4
Rh-101 4.01.1 × 10 23.08.1 × 10 14.1 × 10 11.1 × 10 3
Rh-102 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 14.5 × 10 11.2 × 10 3
Rh-102m 2.05.4 × 10 12.05.4 × 10 12.3 × 10 26.2 × 10 3
Rh-103m 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 31.2 × 10 63.3 × 10 7
Rh-105 1.0 × 10 12.7 × 10 28.0 × 10−12.2 × 10 13.1 × 10 48.4 × 10 5
Rn-222 (a)Radon (86)3.0 × 10−18.14.0 × 10−31.1 × 10−15.7 × 10 31.5 × 10 5
Ru-97Ruthenium (44)5.01.4 × 10 25.01.4 × 10 21.7 × 10 44.6 × 10 5
Ru-103 (a) 2.05.4 × 10 12.05.4 × 10 11.2 × 10 33.2 × 10 4
Ru-105 1.02.7 × 10 16.0 × 10−11.6 × 10 12.5 × 10 56.7 × 10 6
Ru-106 (a) 2.0 × 10−15.42.0 × 10−15.41.2 × 10 23.3 × 10 3
S-35Sulphur (16)4.0 × 10 11.1 × 10 33.08.1 × 10 11.6 × 10 34.3 × 10 4
Sb-122Antimony (51)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 11.5 × 10 44.0 × 10 5
Sb-124 6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 16.5 × 10 21.7 × 10 4
Sb-125 2.05.4 × 10 11.02.7 × 10 13.9 × 10 11.0 × 10 3
Sb-126 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 13.1 × 10 38.4 × 10 4
Sc-44Scandium (21)5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 16.7 × 10 51.8 × 10 7
Sc-46 5.0 × 10−11.4 × 10 15.0 × 10−11.4 × 10 11.3 × 10 33.4 × 10 4
Sc-47 1.0 × 10 12.7 × 10 27.0 × 10−11.9 × 10 13.1 × 10 48.3 × 10 5
Sc-48 3.0 × 10−18.13.0 × 10−18.15.5 × 10 41.5 × 10 6
Se-75Selenium (34)3.08.1 × 10 13.08.1 × 10 15.4 × 10 21.5 × 10 4
Se-79 4.0 × 10 11.1 × 10 32.05.4 × 10 12.6 × 10−37.0 × 10−2
Si-31Silicon (14)6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 11.4 × 10 63.9 × 10 7
Si-32 4.0 × 10 11.1 × 10 35.0 × 10−11.4 × 10 13.91.1 × 10 2
Sm-145Samarium (62)1.0 × 10 12.7 × 10 21.0 × 10 12.7 × 10 29.8 × 10 12.6 × 10 3
Sm-147UnlimitedUnlimitedUnlimitedUnlimited8.5 × 10−102.3 × 10−8
Sm-151 4.0 × 10 11.1 × 10 31.0 × 10 12.7 × 10 29.7 × 10−12.6 × 10 1
Sm-153 9.02.4 × 10 26.0 × 10−11.6 × 10 11.6 × 10 44.4 × 10 5
Sn-113 (a)Tin (50)4.01.1 × 10 22.05.4 × 10 13.7 × 10 21.0 × 10 4
Sn-117m 7.01.9 × 10 24.0 × 10−11.1 × 10 13.0 × 10 38.2 × 10 4
Sn-119m 4.0 × 10 11.1 × 10 33.0 × 10 18.1 × 10 21.4 × 10 23.7 × 10 3
Sn-121m (a) 4.0 × 10 11.1 × 10 39.0 × 10−12.4 × 10 12.05.4 × 10 1
Sn-123 8.0 × 10−12.2 × 10 16.0 × 10−11.6 × 10 13.0 × 10 28.2 × 10 3
Sn-125 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 14.0 × 10 31.1 × 10 5
Sn-126 (a) 6.0 × 10−11.6 × 10 14.0 × 10−11.1 × 10 11.0 × 10−32.8 × 10−2
Sr-82 (a)Strontium (38)2.0 × 10−15.42.0 × 10−15.42.3 × 10 36.2 × 10 4
Sr-85 2.05.4 × 10 12.05.4 × 10 18.8 × 10 22.4 × 10 4
Sr-85m 5.01.4 × 10 25.01.4 × 10 21.2 × 10 63.3 × 10 7
Sr-87m 3.08.1 × 10 13.08.1 × 10 14.8 × 10 51.3 × 10 7
Sr-89 6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 11.1 × 10 32.9 × 10 4
Sr-90 (a) 3.0 × 10−18.13.0 × 10−18.15.11.4 × 10 2
Sr-91 (a) 3.0 × 10−18.13.0 × 10−18.11.3 × 10 53.6 × 10 6
Sr-92 (a) 1.02.7 × 10 13.0 × 10−18.14.7 × 10 51.3 × 10 7
T(H-3)Tritium (1)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 33.6 × 10 29.7 × 10 3
Ta-178 (long-lived)Tantalum (73)1.02.7 × 10 18.0 × 10−12.2 × 10 14.2 × 10 61.1 × 10 8
Ta-179 3.0 × 10 18.1 × 10 23.0 × 10 18.1 × 10 24.1 × 10 11.1 × 10 3
Ta-182 9.0 × 10−12.4 × 10 15.0 × 10−11.4 × 10 12.3 × 10 26.2 × 10 3
Tb-157Terbium (65)4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 35.6 × 10−11.5 × 10 1
Tb-158 1.02.7 × 10 11.02.7 × 10 15.6 × 10−11.5 × 10 1
Tb-160 1.02.7 × 10 16.0 × 10−11.6 × 10 14.2 × 10 21.1 × 10 4
Tc-95m (a)Technetium (43)2.05.4 × 10 12.05.4 × 10 18.3 × 10 22.2 × 10 4
Tc-96 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 11.2 × 10 43.2 × 10 5
Tc-96m (a) 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 11.4 × 10 63.8 × 10 7
Tc-97 UnlimitedUnlimitedUnlimitedUnlimited5.2 × 10−51.4 × 10−3
Tc-97m 4.0 × 10 11.1 × 10 31.02.7 × 10 15.6 × 10 21.5 × 10 4
Tc-98 8.0 × 10−12.2 × 10 17.0 × 10−11.9 × 10 13.2 × 10−58.7 × 10−4
Tc-99 4.0 × 10 11.1 × 10 39.0 × 10−12.4 × 10 16.3 × 10−41.7 × 10−2
Tc-99m 1.0 × 10 12.7 × 10 24.01.1 × 10 21.9 × 10 55.3 × 10 6
Te-121Tellurium (52)2.05.4 × 10 12.05.4 × 10 12.4 × 10 36.4 × 10 4
Te-121m 5.01.4 × 10 23.08.1 × 10 12.6 × 10 27.0 × 10 3
Te-123m 8.02.2 × 10 21.02.7 × 10 13.3 × 10 28.9 × 10 3
Te-125m 2.0 × 10 15.4 × 10 29.0 × 10−12.4 × 10 16.7 × 10 21.8 × 10 4
Te-127 2.0 × 10 15.4 × 10 27.0 × 10−11.9 × 10 19.8 × 10 42.6 × 10 6
Te-127m (a) 2.0 × 10 15.4 × 10 25.0 × 10−11.4 × 10 13.5 × 10 29.4 × 10 3
Te-129 7.0 × 10−11.9 × 10 16.0 × 10−11.6 × 10 17.7 × 10 52.1 × 10 7
Te-129m (a) 8.0 × 10−12.2 × 10 14.0 × 10−11.1 × 10 11.1 × 10 33.0 × 10 4
Te-131m (a) 7.0 × 10−11.9 × 10 15.0 × 10−11.4 × 10 13.0 × 10 48.0 × 10 5
Te-132 (a) 5.0 × 10−11.4 × 10 14.0 × 10−11.1 × 10 11.1 × 10 43.0 × 10 5
Th-227Thorium (90)1.0 × 10 12.7 × 10 25.0 × 10−31.4 × 10−11.1 × 10 33.1 × 10 4
Th-228 (a) 5.0 × 10−11.4 × 10 11.0 × 10−32.7 × 10−23.0 × 10 18.2 × 10 2
Th-229 5.01.4 × 10 25.0 × 10−41.4 × 10−27.9 × 10−32.1 × 10−1
Th-230 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−27.6 × 10−42.1 × 10−2
Th-231 4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−12.0 × 10 45.3 × 10 5
Th-232 UnlimitedUnlimitedUnlimitedUnlimited4.0 × 10−91.1 × 10−7
Th-234 (a) 3.0 × 10−18.13.0 × 10−18.18.6 × 10 22.3 × 10 4
Th(nat) UnlimitedUnlimitedUnlimitedUnlimited8.1 × 10−92.2 × 10−7
Ti-44 (a)Titanium (22)5.0 × 10−11.4 × 10 14.0 × 10−11.1 × 10 16.41.7 × 10 2
Tl-200Thallium (81)9.0 × 10−12.4 × 10 19.0 × 10−12.4 × 10 12.2 × 10 46.0 × 10 5
Tl-201 1.0 × 10 12.7 × 10 24.01.1 × 10 27.9 × 10 32.1 × 10 5
Tl-202 2.05.4 × 10 12.05.4 × 10 12.0 × 10 35.3 × 10 4
Tl-204 1.0 × 10 12.7 × 10 27.0 × 10−11.9 × 10 11.7 × 10 14.6 × 10 2
Tm-167Thulium (69)7.01.9 × 10 28.0 × 10−12.2 × 10 13.1 × 10 38.5 × 10 4
Tm-170 3.08.1 × 10 16.0 × 10−11.6 × 10 12.2 × 10 26.0 × 10 3
Tm-171 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 3
U-230 (fast lung absorption) (a)(d)Uranium (92)4.0 × 10 11.1 × 10 31.0 × 10−12.71.0 × 10 32.7 × 10 4
U-230 (medium lung absorption) (a)(e) 4.0 × 10 11.1 × 10 34.0 × 10−31.1 × 10−11.0 × 10 32.7 × 10 4
U-230 (slow lung absorption) (a)(f) 3.0 × 10 18.1 × 10 23.0 × 10−38.1 × 10−21.0 × 10 32.7 × 10 4
U-232 (fast lung absorption) (d) 4.0 × 10 11.1 × 10 31.0 × 10−22.7 × 10−18.3 × 10−12.2 × 10 1
U-232 (medium lung absorption) (e) 4.0 × 10 11.1 × 10 37.0 × 10−31.9 × 10−18.3 × 10−12.2 × 10 1
U-232 (slow lung absorption) (f) 1.0 × 10 12.7 × 10 21.0 × 10−32.7 × 10−28.3 × 10−12.2 × 10 1
U-233 (fast lung absorption) (d) 4.0 × 10 11.1 × 10 39.0 × 10−22.43.6 × 10−49.7 × 10−3
U-233 (medium lung absorption) (e) 4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−13.6 × 10−49.7 × 10−3
U-233 (slow lung absorption) (f) 4.0 × 10 11.1 × 10 36.0 × 10−31.6 × 10−13.6 × 10−49.7 × 10−3
U-234 (fast lung absorption) (d) 4.0 × 10 11.1 × 10 39.0 × 10−22.42.3 × 10−46.2 × 10−3
U-234 (medium lung absorption) (e) 4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−12.3 × 10−46.2 × 10−3
U-234 (slow lung absorption) (f) 4.0 × 10 11.1 × 10 36.0 × 10−31.6 × 10−12.3 × 10−46.2 × 10−3
U-235 (all lung absorption types) (a),(d),(e),(f) UnlimitedUnlimitedUnlimitedUnlimited8.0 × 10−82.2 × 10−6
U-236 (fast lung absorption) (d) UnlimitedUnlimitedUnlimitedUnlimited2.4 × 10−66.5 × 10−5
U-236 (medium lung absorption) (e) 4.0 × 10 11.1 × 10 32.0 × 10−25.4 × 10−12.4 × 10−66.5 × 10−5
U-236 (slow lung absorption) (f) 4.0 × 10 11.1 × 10 36.0 × 10−31.6 × 10−12.4 × 10−66.5 × 10−5
U-238 (all lung absorption types) (d),(e),(f) UnlimitedUnlimitedUnlimitedUnlimited1.2 × 10−83.4 × 10−7
U (nat) UnlimitedUnlimitedUnlimitedUnlimited2.6 × 10−87.1 × 10−7
U (enriched to 20% or less)(g) UnlimitedUnlimitedUnlimitedUnlimitedsee § 173.434see § 173.434
U (dep) UnlimitedUnlimitedUnlimitedUnlimitedsee § 173.434see § 173.434
V-48Vanadium (23)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 16.3 × 10 31.7 × 10 5
V-49 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 33.0 × 10 28.1 × 10 3
W-178 (a)Tungsten (74)9.02.4 × 10 25.01.4 × 10 21.3 × 10 33.4 × 10 4
W-181 3.0 × 10 18.1 × 10 23.0 × 10 18.1 × 10 22.2 × 10 26.0 × 10 3
W-185 4.0 × 10 11.1 × 10 38.0 × 10−12.2 × 10 13.5 × 10 29.4 × 10 3
W-187 2.05.4 × 10 16.0 × 10−11.6 × 10 12.6 × 10 47.0 × 10 5
W-188 (a) 4.0 × 10−11.1 × 10 13.0 × 10−18.13.7 × 10 21.0 × 10 4
Xe-122 (a)Xenon (54)4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 14.8 × 10 41.3 × 10 6
Xe-123 2.05.4 × 10 17.0 × 10−11.9 × 10 14.4 × 10 51.2 × 10 7
Xe-127 4.01.1 × 10 22.05.4 × 10 11.0 × 10 32.8 × 10 4
Xe-131m 4.0 × 10 11.1 × 10 34.0 × 10 11.1 × 10 33.1 × 10 38.4 × 10 4
Xe-133 2.0 × 10 15.4 × 10 21.0 × 10 12.7 × 10 26.9 × 10 31.9 × 10 5
Xe-135 3.08.1 × 10 12.05.4 × 10 19.5 × 10 42.6 × 10 6
Y-87 (a)Yttrium (39)1.02.7 × 10 11.02.7 × 10 11.7 × 10 44.5 × 10 5
Y-88 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 15.2 × 10 21.4 × 10 4
Y-90 3.0 × 10−18.13.0 × 10−18.12.0 × 10 45.4 × 10 5
Y-91 6.0 × 10−11.6 × 10 16.0 × 10−11.6 × 10 19.1 × 10 22.5 × 10 4
Y-91m 2.05.4 × 10 12.05.4 × 10 11.5 × 10 64.2 × 10 7
Y-92 2.0 × 10−15.42.0 × 10−15.43.6 × 10 59.6 × 10 6
Y-93 3.0 × 10−18.13.0 × 10−18.11.2 × 10 53.3 × 10 6
Yb-169Ytterbium (70)4.01.1 × 10 21.02.7 × 10 18.9 × 10 22.4 × 10 4
Yb-175 3.0 × 10 18.1 × 10 29.0 × 10−12.4 × 10 16.6 × 10 31.8 × 10 5
Zn-65Zinc (30)2.05.4 × 10 12.05.4 × 10 13.0 × 10 28.2 × 10 3
Zn-69 3.08.1 × 10 16.0 × 10−11.6 × 10 11.8 × 10 64.9 × 10 7
Zn-69m (a) 3.08.1 × 10 16.0 × 10−11.6 × 10 11.2 × 10 53.3 × 10 6
Zr-88Zirconium (40)3.08.1 × 10 13.08.1 × 10 16.6 × 10 21.8 × 10 4
Zr-93 UnlimitedUnlimitedUnlimitedUnlimited9.3 × 10−52.5 × 10−3
Zr-95 (a) 2.05.4 × 10 18.0 × 10−12.2 × 10 17.9 × 10 22.1 × 10 4
Zr-97 (a) 4.0 × 10−11.1 × 10 14.0 × 10−11.1 × 10 17.1 × 10 41.9 × 10 6

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]