49 CFR 173.435 — Table of A1 and A2 values for radionuclides.

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

Symbol ofradionuclide Element andatomic 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 × 10 1 5.4 × 10 2 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 × 10 0 1.1 × 10 2 2.0 × 10 0 5.4 × 10 1 4.2 × 10 4 1.1 × 10 6 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 × 10 1 6.0 × 10−1 1.6 × 10 1 1.8 × 10 4 4.8 × 10 5 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 a A1 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, UO2 F2 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.