Table of A<sub>1</sub> and A<sub>2</sub> values for radionuclides.

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§ 173.435 Table of A1 and A2 values for radionuclides.

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

Expand Table
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 −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]


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