Title 49

SECTION 173.435

173.435 Table of A1 and A2 values for radionuclides.

§ 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 × 10−1 2.2 × 10 1 6.0 × 10−3 1.6 × 10−1 2.1 × 10 3 5.8 × 10 4
Ac-227 (a) 9.0 × 10−1 2.4 × 10 1 9.0 × 10−5 2.4 × 10−3 2.7 7.2 × 10 1
Ac-228 6.0 × 10−1 1.6 × 10 1 5.0 × 10−1 1.4 × 10 1 8.4 × 10 4 2.2 × 10 6
Ag-105 Silver (47) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 1.1 × 10 3 3.0 × 10 4
Ag-108m (a) 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 9.7 × 10−1 2.6 × 10 1
Ag-110m (a) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.8 × 10 2 4.7 × 10 3
Ag-111 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 5.8 × 10 3 1.6 × 10 5
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 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 1.3 × 10−1 3.4
Am-242m (a) 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 3.6 × 10−1 1.0 × 10 1
Am-243 (a) 5.0 1.4 × 10 2 1.0 × 10−3 2.7 × 10−2 7.4 × 10−3 2.0 × 10−1
Ar-37 Argon (18) 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 3.7 × 10 3 9.9 × 10 4
Ar-39 4.0 × 10 1 1.1 × 10 3 2.0 × 10 1 5.4 × 10 2 1.3 3.4 × 10 1
Ar-41 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.5 × 10 6 4.2 × 10 7
As-72 Arsenic (33) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 6.2 × 10 4 1.7 × 10 6
As-73 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 8.2 × 10 2 2.2 × 10 4
As-74 1.0 2.7 × 10 1 9.0 × 10−1 2.4 × 10 1 3.7 × 10 3 9.9 × 10 4
As-76 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.8 × 10 4 1.6 × 10 6
As-77 2.0 × 10 1 5.4 × 10 2 7.0 × 10−1 1.9 × 10 1 3.9 × 10 4 1.0 × 10 6
At-211 (a) Astatine (85) 2.0 × 10 1 5.4 × 10 2 5.0 × 10−1 1.4 × 10 1 7.6 × 10 4 2.1 × 10 6
Au-193 Gold (79) 7.0 1.9 × 10 2 2.0 5.4 × 10 1 3.4 × 10 4 9.2 × 10 5
Au-194 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.5 × 10 4 4.1 × 10 5
Au-195 1.0 × 10 1 2.7 × 10 2 6.0 1.6 × 10 2 1.4 × 10 2 3.7 × 10 3
Au-198 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 9.0 × 10 3 2.4 × 10 5
Au-199 1.0 × 10 1 2.7 × 10 2 6.0 × 10−1 1.6 × 10 1 7.7 × 10 3 2.1 × 10 5
Ba-131 (a) Barium (56) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 3.1 × 10 3 8.4 × 10 4
Ba-133 3.0 8.1 × 10 1 3.0 8.1 × 10 1 9.4 2.6 × 10 2
Ba-133m 2.0 × 10 1 5.4 × 10 2 6.0 × 10−1 1.6 × 10 1 2.2 × 10 4 6.1 × 10 5
Ba-140 (a) 5.0 × 10−1 1.4 × 10 1 3.0 × 10−1 8.1 2.7 × 10 3 7.3 × 10 4
Be-7 Beryllium (4) 2.0 × 10 1 5.4 × 10 2 2.0 × 10 1 5.4 × 10 2 1.3 × 10 4 3.5 × 10 5
Be-10 4.0 × 10 1 1.1 × 10 3 6.0 × 10−1 1.6 × 10 1 8.3 × 10−4 2.2 × 10−2
Bi-205 Bismuth (83) 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 1.5 × 10 3 4.2 × 10 4
Bi-206 3.0 × 10−1 8.1 3.0 × 10−1 8.1 3.8 × 10 3 1.0 × 10 5
Bi-207 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 1.9 5.2 × 10 1
Bi-210 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 4.6 × 10 3 1.2 × 10 5
Bi-210m (a) 6.0 × 10−1 1.6 × 10 1 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 × 10 1 6.0 × 10−1 1.6 × 10 1 5.4 × 10 5 1.5 × 10 7
Bk-247 Berkelium (97) 8.0 2.2 × 10 2 8.0 × 10−4 2.2 × 10−2 3.8 × 10−2 1.0
Bk-249 (a) 4.0 × 10 1 1.1 × 10 3 3.0 × 10−1 8.1 6.1 × 10 1 1.6 × 10 3
Br-76 Bromine (35) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 9.4 × 10 4 2.5 × 10 6
Br-77 3.0 8.1 × 10 1 3.0 8.1 × 10 1 2.6 × 10 4 7.1 × 10 5
Br-82 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 4.0 × 10 4 1.1 × 10 6
C-11 Carbon (6) 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 3.1 × 10 7 8.4 × 10 8
C-14 4.0 × 10 1 1.1 × 10 3 3.0 8.1 × 10 1 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 × 10 1 1.1 × 10 3 1.0 2.7 × 10 1 6.6 × 10 2 1.8 × 10 4
Ca-47 (a) 3.0 8.1 × 10 1 3.0 × 10−1 8.1 2.3 × 10 4 6.1 × 10 5
Cd-109 Cadmium (48) 3.0 × 10 1 8.1 × 10 2 2.0 5.4 × 10 1 9.6 × 10 1 2.6 × 10 3
Cd-113m 4.0 × 10 1 1.1 × 10 3 5.0 × 10−1 1.4 × 10 1 8.3 2.2 × 10 2
Cd-115 (a) 3.0 8.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.9 × 10 4 5.1 × 10 5
Cd-115m 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 9.4 × 10 2 2.5 × 10 4
Ce-139 Cerium (58) 7.0 1.9 × 10 2 2.0 5.4 × 10 1 2.5 × 10 2 6.8 × 10 3
Ce-141 2.0 × 10 1 5.4 × 10 2 6.0 × 10−1 1.6 × 10 1 1.1 × 10 3 2.8 × 10 4
Ce-143 9.0 × 10−1 2.4 × 10 1 6.0 × 10−1 1.6 × 10 1 2.5 × 10 4 6.6 × 10 5
Ce-144 (a) 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.2 × 10 2 3.2 × 10 3
Cf-248 Californium (98) 4.0 × 10 1 1.1 × 10 3 6.0 × 10−3 1.6 × 10−1 5.8 × 10 1 1.6 × 10 3
Cf-249 3.0 8.1 × 10 1 8.0 × 10−4 2.2 × 10−2 1.5 × 10−1 4.1
Cf-250 2.0 × 10 1 5.4 × 10 2 2.0 × 10−3 5.4 × 10−2 4.0 1.1 × 10 2
Cf-251 7.0 1.9 × 10 2 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 × 10 1 1.1 × 10 3 4.0 × 10−2 1.1 1.1 × 10 3 2.9 × 10 4
Cf-254 1.0 × 10−3 2.7 × 10−2 1.0 × 10−3 2.7 × 10−2 3.1 × 10 2 8.5 × 10 3
Cl-36 Chlorine (17) 1.0 × 10 1 2.7 × 10 2 6.0 × 10−1 1.6 × 10 1 1.2 × 10−3 3.3 × 10−2
Cl-38 2.0 × 10−1 5.4 2.0 × 10−1 5.4 4.9 × 10 6 1.3 × 10 8
Cm-240 Curium (96) 4.0 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 7.5 × 10 2 2.0 × 10 4
Cm-241 2.0 5.4 × 10 1 1.0 2.7 × 10 1 6.1 × 10 2 1.7 × 10 4
Cm-242 4.0 × 10 1 1.1 × 10 3 1.0 × 10−2 2.7 × 10−1 1.2 × 10 2 3.3 × 10 3
Cm-243 9.0 2.4 × 10 2 1.0 × 10−3 2.7 × 10−2 1.9 5.2 × 10 1
Cm-244 2.0 × 10 1 5.4 × 10 2 2.0 × 10−3 5.4 × 10−2 3.0 8.1 × 10 1
Cm-245 9.0 2.4 × 10 2 9.0 × 10−4 2.4 × 10−2 6.4 × 10−3 1.7 × 10−1
Cm-246 9.0 2.4 × 10 2 9.0 × 10−4 2.4 × 10−2 1.1 × 10−2 3.1 × 10−1
Cm-247 (a) 3.0 8.1 × 10 1 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 × 10 1 5.0 × 10−1 1.4 × 10 1 1.1 × 10 5 3.1 × 10 6
Co-56 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.1 × 10 3 3.0 × 10 4
Co-57 1.0 × 10 1 2.7 × 10 2 1.0 × 10 1 2.7 × 10 2 3.1 × 10 2 8.4 × 10 3
Co-58 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.2 × 10 3 3.2 × 10 4
Co-58m 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 2.2 × 10 5 5.9 × 10 6
Co-60 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 4.2 × 10 1 1.1 × 10 3
Cr-51 Chromium (24) 3.0 × 10 1 8.1 × 10 2 3.0 × 10 1 8.1 × 10 2 3.4 × 10 3 9.2 × 10 4
Cs-129 Cesium (55) 4.0 1.1 × 10 2 4.0 1.1 × 10 2 2.8 × 10 4 7.6 × 10 5
Cs-131 3.0 × 10 1 8.1 × 10 2 3.0 × 10 1 8.1 × 10 2 3.8 × 10 3 1.0 × 10 5
Cs-132 1.0 2.7 × 10 1 1.0 2.7 × 10 1 5.7 × 10 3 1.5 × 10 5
Cs-134 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 4.8 × 10 1 1.3 × 10 3
Cs-134m 4.0 × 10 1 1.1 × 10 3 6.0 × 10−1 1.6 × 10 1 3.0 × 10 5 8.0 × 10 6
Cs-135 4.0 × 10 1 1.1 × 10 3 1.0 2.7 × 10 1 4.3 × 10−5 1.2 × 10−3
Cs-136 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 2.7 × 10 3 7.3 × 10 4
Cs-137 (a) 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 3.2 8.7 × 10 1
Cu-64 Copper (29) 6.0 1.6 × 10 2 1.0 2.7 × 10 1 1.4 × 10 5 3.9 × 10 6
Cu-67 1.0 × 10 1 2.7 × 10 2 7.0 × 10−1 1.9 × 10 1 2.8 × 10 4 7.6 × 10 5
Dy-159 Dysprosium (66) 2.0 × 10 1 5.4 × 10 2 2.0 × 10 1 5.4 × 10 2 2.1 × 10 2 5.7 × 10 3
Dy-165 9.0 × 10−1 2.4 × 10 1 6.0 × 10−1 1.6 × 10 1 3.0 × 10 5 8.2 × 10 6
Dy-166 (a) 9.0 × 10−1 2.4 × 10 1 3.0 × 10−1 8.1 8.6 × 10 3 2.3 × 10 5
Er-169 Erbium (68) 4.0 × 10 1 1.1 × 10 3 1.0 2.7 × 10 1 3.1 × 10 3 8.3 × 10 4
Er-171 8.0 × 10−1 2.2 × 10 1 5.0 × 10−1 1.4 × 10 1 9.0 × 10 4 2.4 × 10 6
Eu-147 Europium (63) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 1.4 × 10 3 3.7 × 10 4
Eu-148 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 6.0 × 10 2 1.6 × 10 4
Eu-149 2.0 × 10 1 5.4 × 10 2 2.0 × 10 1 5.4 × 10 2 3.5 × 10 2 9.4 × 10 3
Eu-150 (short lived) 2.0 5.4 × 10 1 7.0 × 10−1 1.9 × 10 1 6.1 × 10 4 1.6 × 10 6
Eu-150 (long lived) 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 6.1 × 10 4 1.6 × 10 6
Eu-152 1.0 2.7 × 10 1 1.0 2.7 × 10 1 6.5 1.8 × 10 2
Eu-152m 8.0 × 10−1 2.2 × 10 1 8.0 × 10−1 2.2 × 10 1 8.2 × 10 4 2.2 × 10 6
Eu-154 9.0 × 10−1 2.4 × 10 1 6.0 × 10−1 1.6 × 10 1 9.8 2.6 × 10 2
Eu-155 2.0 × 10 1 5.4 × 10 2 3.0 8.1 × 10 1 1.8 × 10 1 4.9 × 10 2
Eu-156 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 2.0 × 10 3 5.5 × 10 4
F-18 Fluorine (9) 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 3.5 × 10 6 9.5 × 10 7
Fe-52 (a) Iron (26) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.7 × 10 5 7.3 × 10 6
Fe-55 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 8.8 × 10 1 2.4 × 10 3
Fe-59 9.0 × 10−1 2.4 × 10 1 9.0 × 10−1 2.4 × 10 1 1.8 × 10 3 5.0 × 10 4
Fe-60 (a) 4.0 × 10 1 1.1 × 10 3 2.0 × 10−1 5.4 7.4 × 10−4 2.0 × 10−2
Ga-67 Gallium (31) 7.0 1.9 × 10 2 3.0 8.1 × 10 1 2.2 × 10 4 6.0 × 10 5
Ga-68 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 1.5 × 10 6 4.1 × 10 7
Ga-72 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.1 × 10 5 3.1 × 10 6
Gd-146 (a) Gadolinium (64) 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 6.9 × 10 2 1.9 × 10 4
Gd-148 2.0 × 10 1 5.4 × 10 2 2.0 × 10−3 5.4 × 10−2 1.2 3.2 × 10 1
Gd-153 1.0 × 10 1 2.7 × 10 2 9.0 2.4 × 10 2 1.3 × 10 2 3.5 × 10 3
Gd-159 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 3.9 × 10 4 1.1 × 10 6
Ge-68 (a) Germanium (32) 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 2.6 × 10 2 7.1 × 10 3
Ge-71 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 5.8 × 10 3 1.6 × 10 5
Ge-77 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.3 × 10 5 3.6 × 10 6
Hf-172 (a) Hafnium (72) 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 4.1 × 10 1 1.1 × 10 3
Hf-175 3.0 8.1 × 10 1 3.0 8.1 × 10 1 3.9 × 10 2 1.1 × 10 4
Hf-181 2.0 5.4 × 10 1 5.0 × 10−1 1.4 × 10 1 6.3 × 10 2 1.7 × 10 4
Hf-182 Unlimited Unlimited Unlimited Unlimited 8.1 × 10−6 2.2 × 10−4
Hg-194 (a) Mercury (80) 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.3 × 10−1 3.5
Hg-195m (a) 3.0 8.1 × 10 1 7.0 × 10−1 1.9 × 10 1 1.5 × 10 4 4.0 × 10 5
Hg-197 2.0 × 10 1 5.4 × 10 2 1.0 × 10 1 2.7 × 10 2 9.2 × 10 3 2.5 × 10 5
Hg-197m 1.0 × 10 1 2.7 × 10 2 4.0 × 10−1 1.1 × 10 1 2.5 × 10 4 6.7 × 10 5
Hg-203 5.0 1.4 × 10 2 1.0 2.7 × 10 1 5.1 × 10 2 1.4 × 10 4
Ho-166 Holmium (67) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 2.6 × 10 4 7.0 × 10 5
Ho-166m 6.0 × 10−1 1.6 × 10 1 5.0 × 10−1 1.4 × 10 1 6.6 × 10−2 1.8
I-123 Iodine (53) 6.0 1.6 × 10 2 3.0 8.1 × 10 1 7.1 × 10 4 1.9 × 10 6
I-124 1.0 2.7 × 10 1 1.0 2.7 × 10 1 9.3 × 10 3 2.5 × 10 5
I-125 2.0 × 10 1 5.4 × 10 2 3.0 8.1 × 10 1 6.4 × 10 2 1.7 × 10 4
I-126 2.0 5.4 × 10 1 1.0 2.7 × 10 1 2.9 × 10 3 8.0 × 10 4
I-129 Unlimited Unlimited Unlimited Unlimited 6.5 × 10−6 1.8 × 10−4
I-131 3.0 8.1 × 10 1 7.0 × 10−1 1.9 × 10 1 4.6 × 10 3 1.2 × 10 5
I-132 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 3.8 × 10 5 1.0 × 10 7
I-133 7.0 × 10−1 1.9 × 10 1 6.0 × 10−1 1.6 × 10 1 4.2 × 10 4 1.1 × 10 6
I-134 3.0 × 10−1 8.1 3.0 × 10−1 8.1 9.9 × 10 5 2.7 × 10 7
I-135 (a) 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 1.3 × 10 5 3.5 × 10 6
In-111 Indium (49) 3.0 8.1 × 10 1 3.0 8.1 × 10 1 1.5 × 10 4 4.2 × 10 5
In-113m 4.0 1.1 × 10 2 2.0 5.4 × 10 1 6.2 × 10 5 1.7 × 10 7
In-114m (a) 1.0 × 10 1 2.7 × 10 2 5.0 × 10−1 1.4 × 10 1 8.6 × 10 2 2.3 × 10 4
In-115m 7.0 1.9 × 10 2 1.0 2.7 × 10 1 2.2 × 10 5 6.1 × 10 6
Ir-189 (a) Iridium (77) 1.0 × 10 1 2.7 × 10 2 1.0 × 10 1 2.7 × 10 2 1.9 × 10 3 5.2 × 10 4
Ir-190 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 2.3 × 10 3 6.2 × 10 4
Ir-192 (c) 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 3.4 × 10 2 9.2 × 10 3
Ir-194 3.0 × 10−1 8.1 3.0 × 10−1 8.1 3.1 × 10 4 8.4 × 10 5
K-40 Potassium (19) 9.0 × 10−1 2.4 × 10 1 9.0 × 10−1 2.4 × 10 1 2.4 × 10−7 6.4 × 10−6
K-42 2.0 × 10−1 5.4 2.0 × 10−1 5.4 2.2 × 10 5 6.0 × 10 6
K-43 7.0 × 10−1 1.9 × 10 1 6.0 × 10−1 1.6 × 10 1 1.2 × 10 5 3.3 × 10 6
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 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 7.8 × 10−4 2.1 × 10−2
Kr-85 1.0 × 10 1 2.7 × 10 2 1.0 × 10 1 2.7 × 10 2 1.5 × 10 1 3.9 × 10 2
Kr-85m 8.0 2.2 × 10 2 3.0 8.1 × 10 1 3.0 × 10 5 8.2 × 10 6
Kr-87 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.0 × 10 6 2.8 × 10 7
La-137 Lanthanum (57) 3.0 × 10 1 8.1 × 10 2 6.0 1.6 × 10 2 1.6 × 10−3 4.4 × 10−2
La-140 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 2.1 × 10 4 5.6 × 10 5
Lu-172 Lutetium (71) 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 4.2 × 10 3 1.1 × 10 5
Lu-173 8.0 2.2 × 10 2 8.0 2.2 × 10 2 5.6 × 10 1 1.5 × 10 3
Lu-174 9.0 2.4 × 10 2 9.0 2.4 × 10 2 2.3 × 10 1 6.2 × 10 2
Lu-174m 2.0 × 10 1 5.4 × 10 2 1.0 × 10 1 2.7 × 10 2 2.0 × 10 2 5.3 × 10 3
Lu-177 3.0 × 10 1 8.1 × 10 2 7.0 × 10−1 1.9 × 10 1 4.1 × 10 3 1.1 × 10 5
Mg-28 (a) Magnesium (12) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.0 × 10 5 5.4 × 10 6
Mn-52 Manganese (25) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.6 × 10 4 4.4 × 10 5
Mn-53 Unlimited Unlimited Unlimited Unlimited 6.8 × 10−5 1.8 × 10−3
Mn-54 1.0 2.7 × 10 1 1.0 2.7 × 10 1 2.9 × 10 2 7.7 × 10 3
Mn-56 3.0 × 10−1 8.1 3.0 × 10−1 8.1 8.0 × 10 5 2.2 × 10 7
Mo-93 Molybdenum (42) 4.0 × 10 1 1.1 × 10 3 2.0 × 10 1 5.4 × 10 2 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 × 10 1 6.0 × 10−1 1.6 × 10 1 5.4 × 10 7 1.5 × 10 9
Na-22 Sodium (11) 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 2.3 × 10 2 6.3 × 10 3
Na-24 2.0 × 10−1 5.4 2.0 × 10−1 5.4 3.2 × 10 5 8.7 × 10 6
Nb-93m Niobium (41) 4.0 × 10 1 1.1 × 10 3 3.0 × 10 1 8.1 × 10 2 8.8 2.4 × 10 2
Nb-94 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 6.9 × 10−3 1.9 × 10−1
Nb-95 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.5 × 10 3 3.9 × 10 4
Nb-97 9.0 × 10−1 2.4 × 10 1 6.0 × 10−1 1.6 × 10 1 9.9 × 10 5 2.7 × 10 7
Nd-147 Neodymium (60) 6.0 1.6 × 10 2 6.0 × 10−1 1.6 × 10 1 3.0 × 10 3 8.1 × 10 4
Nd-149 6.0 × 10−1 1.6 × 10 1 5.0 × 10−1 1.4 × 10 1 4.5 × 10 5 1.2 × 10 7
Ni-59 Nickel (28) Unlimited Unlimited Unlimited Unlimited 3.0 × 10−3 8.0 × 10−2
Ni-63 4.0 × 10 1 1.1 × 10 3 3.0 × 10 1 8.1 × 10 2 2.1 5.7 × 10 1
Ni-65 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 7.1 × 10 5 1.9 × 10 7
Np-235 Neptunium (93) 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 5.2 × 10 1 1.4 × 10 3
Np-236 (short-lived) 2.0 × 10 1 5.4 × 10 2 2.0 5.4 × 10 1 4.7 × 10−4 1.3 × 10−2
Np-236 (long-lived) 9.0 × 10 0 2.4 × 10 2 2.0 × 10−2 5.4 × 10−1 4.7 × 10−4 1.3 × 10−2
Np-237 2.0 × 10 1 5.4 × 10 2 2.0 × 10−3 5.4 × 10−2 2.6 × 10−5 7.1 × 10−4
Np-239 7.0 1.9 × 10 2 4.0 × 10−1 1.1 × 10 1 8.6 × 10 3 2.3 × 10 5
Os-185 Osmium (76) 1.0 2.7 × 10 1 1.0 2.7 × 10 1 2.8 × 10 2 7.5 × 10 3
Os-191 1.0 × 10 1 2.7 × 10 2 2.0 5.4 × 10 1 1.6 × 10 3 4.4 × 10 4
Os-191m 4.0 × 10 1 1.1 × 10 3 3.0 × 10 1 8.1 × 10 2 4.6 × 10 4 1.3 × 10 6
Os-193 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 2.0 × 10 4 5.3 × 10 5
Os-194 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.1 × 10 1 3.1 × 10 2
P-32 Phosphorus (15) 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 1.1 × 10 4 2.9 × 10 5
P-33 4.0 × 10 1 1.1 × 10 3 1.0 2.7 × 10 1 5.8 × 10 3 1.6 × 10 5
Pa-230 (a) Protactinium (91) 2.0 5.4 × 10 1 7.0 × 10−2 1.9 1.2 × 10 3 3.3 × 10 4
Pa-231 4.0 1.1 × 10 2 4.0 × 10−4 1.1 × 10−2 1.7 × 10−3 4.7 × 10−2
Pa-233 5.0 1.4 × 10 2 7.0 × 10−1 1.9 × 10 1 7.7 × 10 2 2.1 × 10 4
Pb-201 Lead (82) 1.0 2.7 × 10 1 1.0 2.7 × 10 1 6.2 × 10 4 1.7 × 10 6
Pb-202 4.0 × 10 1 1.1 × 10 3 2.0 × 10 1 5.4 × 10 2 1.2 × 10−4 3.4 × 10−3
Pb-203 4.0 1.1 × 10 2 3.0 8.1 × 10 1 1.1 × 10 4 3.0 × 10 5
Pb-205 Unlimited Unlimited Unlimited Unlimited 4.5 × 10−6 1.2 × 10−4
Pb-210 (a) 1.0 2.7 × 10 1 5.0 × 10−2 1.4 2.8 7.6 × 10 1
Pb-212 (a) 7.0 × 10−1 1.9 × 10 1 2.0 × 10−1 5.4 5.1 × 10 4 1.4 × 10 6
Pd-103 (a) Palladium (46) 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 2.8 × 10 3 7.5 × 10 4
Pd-107 Unlimited Unlimited Unlimited Unlimited 1.9 × 10−5 5.1 × 10−4
Pd-109 2.0 5.4 × 10 1 5.0 × 10−1 1.4 × 10 1 7.9 × 10 4 2.1 × 10 6
Pm-143 Promethium (61) 3.0 8.1 × 10 1 3.0 8.1 × 10 1 1.3 × 10 2 3.4 × 10 3
Pm-144 7.0 × 10−1 1.9 × 10 1 7.0 × 10−1 1.9 × 10 1 9.2 × 10 1 2.5 × 10 3
Pm-145 3.0 × 10 1 8.1 × 10 2 1.0 × 10 1 2.7 × 10 2 5.2 1.4 × 10 2
Pm-147 4.0 × 10 1 1.1 × 10 3 2.0 5.4 × 10 1 3.4 × 10 1 9.3 × 10 2
Pm-148m (a) 8.0 × 10−1 2.2 × 10 1 7.0 × 10−1 1.9 × 10 1 7.9 × 10 2 2.1 × 10 4
Pm-149 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 1.5 × 10 4 4.0 × 10 5
Pm-151 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 2.7 × 10 4 7.3 × 10 5
Po-210 Polonium (84) 4.0 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 1.7 × 10 2 4.5 × 10 3
Pr-142 Praseodymium (59) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 4.3 × 10 4 1.2 × 10 6
Pr-143 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 2.5 × 10 3 6.7 × 10 4
Pt-188 (a) Platinum (78) 1.0 2.7 × 10 1 8.0 × 10−1 2.2 × 10 1 2.5 × 10 3 6.8 × 10 4
Pt-191 4.0 1.1 × 10 2 3.0 8.1 × 10 1 8.7 × 10 3 2.4 × 10 5
Pt-193 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 1.4 3.7 × 10 1
Pt-193m 4.0 × 10 1 1.1 × 10 3 5.0 × 10−1 1.4 × 10 1 5.8 × 10 3 1.6 × 10 5
Pt-195m 1.0 × 10 1 2.7 × 10 2 5.0 × 10−1 1.4 × 10 1 6.2 × 10 3 1.7 × 10 5
Pt-197 2.0 × 10 1 5.4 × 10 2 6.0 × 10−1 1.6 × 10 1 3.2 × 10 4 8.7 × 10 5
Pt-197m 1.0 × 10 1 2.7 × 10 2 6.0 × 10−1 1.6 × 10 1 3.7 × 10 5 1.0 × 10 7
Pu-236 Plutonium (94) 3.0 × 10 1 8.1 × 10 2 3.0 × 10−3 8.1 × 10−2 2.0 × 10 1 5.3 × 10 2
Pu-237 2.0 × 10 1 5.4 × 10 2 2.0 × 10 1 5.4 × 10 2 4.5 × 10 2 1.2 × 10 4
Pu-238 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 6.3 × 10−1 1.7 × 10 1
Pu-239 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 2.3 × 10−3 6.2 × 10−2
Pu-240 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 8.4 × 10−3 2.3 × 10−1
Pu-241 (a) 4.0 × 10 1 1.1 × 10 3 6.0 × 10−2 1.6 3.8 1.0 × 10 2
Pu-242 1.0 × 10 1 2.7 × 10 2 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 × 10 1 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 × 10 1 7.0 × 10−3 1.9 × 10−1 1.9 × 10 3 5.1 × 10 4
Ra-224 (a) 4.0 × 10−1 1.1 × 10 1 2.0 × 10−2 5.4 × 10−1 5.9 × 10 3 1.6 × 10 5
Ra-225 (a) 2.0 × 10−1 5.4 4.0 × 10−3 1.1 × 10−1 1.5 × 10 3 3.9 × 10 4
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 × 10 1 2.0 × 10−2 5.4 × 10−1 1.0 × 10 1 2.7 × 10 2
Rb-81 Rubidium (37) 2.0 5.4 × 10 1 8.0 × 10−1 2.2 × 10 1 3.1 × 10 5 8.4 × 10 6
Rb-83 (a) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 6.8 × 10 2 1.8 × 10 4
Rb-84 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.8 × 10 3 4.7 × 10 4
Rb-86 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 3.0 × 10 3 8.1 × 10 4
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 × 10 1 1.0 2.7 × 10 1 6.9 × 10 2 1.9 × 10 4
Re-184m 3.0 8.1 × 10 1 1.0 2.7 × 10 1 1.6 × 10 2 4.3 × 10 3
Re-186 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 6.9 × 10 3 1.9 × 10 5
Re-187 Unlimited Unlimited Unlimited Unlimited 1.4 × 10−9 3.8 × 10−8
Re-188 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 3.6 × 10 4 9.8 × 10 5
Re-189 (a) 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 2.5 × 10 4 6.8 × 10 5
Re(nat) Unlimited Unlimited Unlimited Unlimited 0.0 2.4 × 10−8
Rh-99 Rhodium (45) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 3.0 × 10 3 8.2 × 10 4
Rh-101 4.0 1.1 × 10 2 3.0 8.1 × 10 1 4.1 × 10 1 1.1 × 10 3
Rh-102 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 4.5 × 10 1 1.2 × 10 3
Rh-102m 2.0 5.4 × 10 1 2.0 5.4 × 10 1 2.3 × 10 2 6.2 × 10 3
Rh-103m 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 1.2 × 10 6 3.3 × 10 7
Rh-105 1.0 × 10 1 2.7 × 10 2 8.0 × 10−1 2.2 × 10 1 3.1 × 10 4 8.4 × 10 5
Rn-222 (a) Radon (86) 3.0 × 10−1 8.1 4.0 × 10−3 1.1 × 10−1 5.7 × 10 3 1.5 × 10 5
Ru-97 Ruthenium (44) 5.0 1.4 × 10 2 5.0 1.4 × 10 2 1.7 × 10 4 4.6 × 10 5
Ru-103 (a) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 1.2 × 10 3 3.2 × 10 4
Ru-105 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 2.5 × 10 5 6.7 × 10 6
Ru-106 (a) 2.0 × 10−1 5.4 2.0 × 10−1 5.4 1.2 × 10 2 3.3 × 10 3
S-35 Sulphur (16) 4.0 × 10 1 1.1 × 10 3 3.0 8.1 × 10 1 1.6 × 10 3 4.3 × 10 4
Sb-122 Antimony (51) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.5 × 10 4 4.0 × 10 5
Sb-124 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 6.5 × 10 2 1.7 × 10 4
Sb-125 2.0 5.4 × 10 1 1.0 2.7 × 10 1 3.9 × 10 1 1.0 × 10 3
Sb-126 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 3.1 × 10 3 8.4 × 10 4
Sc-44 Scandium (21) 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 6.7 × 10 5 1.8 × 10 7
Sc-46 5.0 × 10−1 1.4 × 10 1 5.0 × 10−1 1.4 × 10 1 1.3 × 10 3 3.4 × 10 4
Sc-47 1.0 × 10 1 2.7 × 10 2 7.0 × 10−1 1.9 × 10 1 3.1 × 10 4 8.3 × 10 5
Sc-48 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.5 × 10 4 1.5 × 10 6
Se-75 Selenium (34) 3.0 8.1 × 10 1 3.0 8.1 × 10 1 5.4 × 10 2 1.5 × 10 4
Se-79 4.0 × 10 1 1.1 × 10 3 2.0 5.4 × 10 1 2.6 × 10−3 7.0 × 10−2
Si-31 Silicon (14) 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 1.4 × 10 6 3.9 × 10 7
Si-32 4.0 × 10 1 1.1 × 10 3 5.0 × 10−1 1.4 × 10 1 3.9 1.1 × 10 2
Sm-145 Samarium (62) 1.0 × 10 1 2.7 × 10 2 1.0 × 10 1 2.7 × 10 2 9.8 × 10 1 2.6 × 10 3
Sm-147 Unlimited Unlimited Unlimited Unlimited 8.5 × 10−10 2.3 × 10−8
Sm-151 4.0 × 10 1 1.1 × 10 3 1.0 × 10 1 2.7 × 10 2 9.7 × 10−1 2.6 × 10 1
Sm-153 9.0 2.4 × 10 2 6.0 × 10−1 1.6 × 10 1 1.6 × 10 4 4.4 × 10 5
Sn-113 (a) Tin (50) 4.0 1.1 × 10 2 2.0 5.4 × 10 1 3.7 × 10 2 1.0 × 10 4
Sn-117m 7.0 1.9 × 10 2 4.0 × 10−1 1.1 × 10 1 3.0 × 10 3 8.2 × 10 4
Sn-119m 4.0 × 10 1 1.1 × 10 3 3.0 × 10 1 8.1 × 10 2 1.4 × 10 2 3.7 × 10 3
Sn-121m (a) 4.0 × 10 1 1.1 × 10 3 9.0 × 10−1 2.4 × 10 1 2.0 5.4 × 10 1
Sn-123 8.0 × 10−1 2.2 × 10 1 6.0 × 10−1 1.6 × 10 1 3.0 × 10 2 8.2 × 10 3
Sn-125 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 4.0 × 10 3 1.1 × 10 5
Sn-126 (a) 6.0 × 10−1 1.6 × 10 1 4.0 × 10−1 1.1 × 10 1 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 × 10 3 6.2 × 10 4
Sr-85 2.0 5.4 × 10 1 2.0 5.4 × 10 1 8.8 × 10 2 2.4 × 10 4
Sr-85m 5.0 1.4 × 10 2 5.0 1.4 × 10 2 1.2 × 10 6 3.3 × 10 7
Sr-87m 3.0 8.1 × 10 1 3.0 8.1 × 10 1 4.8 × 10 5 1.3 × 10 7
Sr-89 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 1.1 × 10 3 2.9 × 10 4
Sr-90 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 5.1 1.4 × 10 2
Sr-91 (a) 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.3 × 10 5 3.6 × 10 6
Sr-92 (a) 1.0 2.7 × 10 1 3.0 × 10−1 8.1 4.7 × 10 5 1.3 × 10 7
T(H-3) Tritium (1) 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 3.6 × 10 2 9.7 × 10 3
Ta-178 (long-lived) Tantalum (73) 1.0 2.7 × 10 1 8.0 × 10−1 2.2 × 10 1 4.2 × 10 6 1.1 × 10 8
Ta-179 3.0 × 10 1 8.1 × 10 2 3.0 × 10 1 8.1 × 10 2 4.1 × 10 1 1.1 × 10 3
Ta-182 9.0 × 10−1 2.4 × 10 1 5.0 × 10−1 1.4 × 10 1 2.3 × 10 2 6.2 × 10 3
Tb-157 Terbium (65) 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 5.6 × 10−1 1.5 × 10 1
Tb-158 1.0 2.7 × 10 1 1.0 2.7 × 10 1 5.6 × 10−1 1.5 × 10 1
Tb-160 1.0 2.7 × 10 1 6.0 × 10−1 1.6 × 10 1 4.2 × 10 2 1.1 × 10 4
Tc-95m (a) Technetium (43) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 8.3 × 10 2 2.2 × 10 4
Tc-96 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.2 × 10 4 3.2 × 10 5
Tc-96m (a) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 1.4 × 10 6 3.8 × 10 7
Tc-97 Unlimited Unlimited Unlimited Unlimited 5.2 × 10−5 1.4 × 10−3
Tc-97m 4.0 × 10 1 1.1 × 10 3 1.0 2.7 × 10 1 5.6 × 10 2 1.5 × 10 4
Tc-98 8.0 × 10−1 2.2 × 10 1 7.0 × 10−1 1.9 × 10 1 3.2 × 10−5 8.7 × 10−4
Tc-99 4.0 × 10 1 1.1 × 10 3 9.0 × 10−1 2.4 × 10 1 6.3 × 10−4 1.7 × 10−2
Tc-99m 1.0 × 10 1 2.7 × 10 2 4.0 1.1 × 10 2 1.9 × 10 5 5.3 × 10 6
Te-121 Tellurium (52) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 2.4 × 10 3 6.4 × 10 4
Te-121m 5.0 1.4 × 10 2 3.0 8.1 × 10 1 2.6 × 10 2 7.0 × 10 3
Te-123m 8.0 2.2 × 10 2 1.0 2.7 × 10 1 3.3 × 10 2 8.9 × 10 3
Te-125m 2.0 × 10 1 5.4 × 10 2 9.0 × 10−1 2.4 × 10 1 6.7 × 10 2 1.8 × 10 4
Te-127 2.0 × 10 1 5.4 × 10 2 7.0 × 10−1 1.9 × 10 1 9.8 × 10 4 2.6 × 10 6
Te-127m (a) 2.0 × 10 1 5.4 × 10 2 5.0 × 10−1 1.4 × 10 1 3.5 × 10 2 9.4 × 10 3
Te-129 7.0 × 10−1 1.9 × 10 1 6.0 × 10−1 1.6 × 10 1 7.7 × 10 5 2.1 × 10 7
Te-129m (a) 8.0 × 10−1 2.2 × 10 1 4.0 × 10−1 1.1 × 10 1 1.1 × 10 3 3.0 × 10 4
Te-131m (a) 7.0 × 10−1 1.9 × 10 1 5.0 × 10−1 1.4 × 10 1 3.0 × 10 4 8.0 × 10 5
Te-132 (a) 5.0 × 10−1 1.4 × 10 1 4.0 × 10−1 1.1 × 10 1 1.1 × 10 4 3.0 × 10 5
Th-227 Thorium (90) 1.0 × 10 1 2.7 × 10 2 5.0 × 10−3 1.4 × 10−1 1.1 × 10 3 3.1 × 10 4
Th-228 (a) 5.0 × 10−1 1.4 × 10 1 1.0 × 10−3 2.7 × 10−2 3.0 × 10 1 8.2 × 10 2
Th-229 5.0 1.4 × 10 2 5.0 × 10−4 1.4 × 10−2 7.9 × 10−3 2.1 × 10−1
Th-230 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 7.6 × 10−4 2.1 × 10−2
Th-231 4.0 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 2.0 × 10 4 5.3 × 10 5
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 × 10 2 2.3 × 10 4
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 × 10 1 4.0 × 10−1 1.1 × 10 1 6.4 1.7 × 10 2
Tl-200 Thallium (81) 9.0 × 10−1 2.4 × 10 1 9.0 × 10−1 2.4 × 10 1 2.2 × 10 4 6.0 × 10 5
Tl-201 1.0 × 10 1 2.7 × 10 2 4.0 1.1 × 10 2 7.9 × 10 3 2.1 × 10 5
Tl-202 2.0 5.4 × 10 1 2.0 5.4 × 10 1 2.0 × 10 3 5.3 × 10 4
Tl-204 1.0 × 10 1 2.7 × 10 2 7.0 × 10−1 1.9 × 10 1 1.7 × 10 1 4.6 × 10 2
Tm-167 Thulium (69) 7.0 1.9 × 10 2 8.0 × 10−1 2.2 × 10 1 3.1 × 10 3 8.5 × 10 4
Tm-170 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 2.2 × 10 2 6.0 × 10 3
Tm-171 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3
U-230 (fast lung absorption) (a)(d) Uranium (92) 4.0 × 10 1 1.1 × 10 3 1.0 × 10−1 2.7 1.0 × 10 3 2.7 × 10 4
U-230 (medium lung absorption) (a)(e) 4.0 × 10 1 1.1 × 10 3 4.0 × 10−3 1.1 × 10−1 1.0 × 10 3 2.7 × 10 4
U-230 (slow lung absorption) (a)(f) 3.0 × 10 1 8.1 × 10 2 3.0 × 10−3 8.1 × 10−2 1.0 × 10 3 2.7 × 10 4
U-232 (fast lung absorption) (d) 4.0 × 10 1 1.1 × 10 3 1.0 × 10−2 2.7 × 10−1 8.3 × 10−1 2.2 × 10 1
U-232 (medium lung absorption) (e) 4.0 × 10 1 1.1 × 10 3 7.0 × 10−3 1.9 × 10−1 8.3 × 10−1 2.2 × 10 1
U-232 (slow lung absorption) (f) 1.0 × 10 1 2.7 × 10 2 1.0 × 10−3 2.7 × 10−2 8.3 × 10−1 2.2 × 10 1
U-233 (fast lung absorption) (d) 4.0 × 10 1 1.1 × 10 3 9.0 × 10−2 2.4 3.6 × 10−4 9.7 × 10−3
U-233 (medium lung absorption) (e) 4.0 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 3.6 × 10−4 9.7 × 10−3
U-233 (slow lung absorption) (f) 4.0 × 10 1 1.1 × 10 3 6.0 × 10−3 1.6 × 10−1 3.6 × 10−4 9.7 × 10−3
U-234 (fast lung absorption) (d) 4.0 × 10 1 1.1 × 10 3 9.0 × 10−2 2.4 2.3 × 10−4 6.2 × 10−3
U-234 (medium lung absorption) (e) 4.0 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 2.3 × 10−4 6.2 × 10−3
U-234 (slow lung absorption) (f) 4.0 × 10 1 1.1 × 10 3 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 × 10 1 1.1 × 10 3 2.0 × 10−2 5.4 × 10−1 2.4 × 10−6 6.5 × 10−5
U-236 (slow lung absorption) (f) 4.0 × 10 1 1.1 × 10 3 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 × 10 1 4.0 × 10−1 1.1 × 10 1 6.3 × 10 3 1.7 × 10 5
V-49 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 3.0 × 10 2 8.1 × 10 3
W-178 (a) Tungsten (74) 9.0 2.4 × 10 2 5.0 1.4 × 10 2 1.3 × 10 3 3.4 × 10 4
W-181 3.0 × 10 1 8.1 × 10 2 3.0 × 10 1 8.1 × 10 2 2.2 × 10 2 6.0 × 10 3
W-185 4.0 × 10 1 1.1 × 10 3 8.0 × 10−1 2.2 × 10 1 3.5 × 10 2 9.4 × 10 3
W-187 2.0 5.4 × 10 1 6.0 × 10−1 1.6 × 10 1 2.6 × 10 4 7.0 × 10 5
W-188 (a) 4.0 × 10−1 1.1 × 10 1 3.0 × 10−1 8.1 3.7 × 10 2 1.0 × 10 4
Xe-122 (a) Xenon (54) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 4.8 × 10 4 1.3 × 10 6
Xe-123 2.0 5.4 × 10 1 7.0 × 10−1 1.9 × 10 1 4.4 × 10 5 1.2 × 10 7
Xe-127 4.0 1.1 × 10 2 2.0 5.4 × 10 1 1.0 × 10 3 2.8 × 10 4
Xe-131m 4.0 × 10 1 1.1 × 10 3 4.0 × 10 1 1.1 × 10 3 3.1 × 10 3 8.4 × 10 4
Xe-133 2.0 × 10 1 5.4 × 10 2 1.0 × 10 1 2.7 × 10 2 6.9 × 10 3 1.9 × 10 5
Xe-135 3.0 8.1 × 10 1 2.0 5.4 × 10 1 9.5 × 10 4 2.6 × 10 6
Y-87 (a) Yttrium (39) 1.0 2.7 × 10 1 1.0 2.7 × 10 1 1.7 × 10 4 4.5 × 10 5
Y-88 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 5.2 × 10 2 1.4 × 10 4
Y-90 3.0 × 10−1 8.1 3.0 × 10−1 8.1 2.0 × 10 4 5.4 × 10 5
Y-91 6.0 × 10−1 1.6 × 10 1 6.0 × 10−1 1.6 × 10 1 9.1 × 10 2 2.5 × 10 4
Y-91m 2.0 5.4 × 10 1 2.0 5.4 × 10 1 1.5 × 10 6 4.2 × 10 7
Y-92 2.0 × 10−1 5.4 2.0 × 10−1 5.4 3.6 × 10 5 9.6 × 10 6
Y-93 3.0 × 10−1 8.1 3.0 × 10−1 8.1 1.2 × 10 5 3.3 × 10 6
Yb-169 Ytterbium (70) 4.0 1.1 × 10 2 1.0 2.7 × 10 1 8.9 × 10 2 2.4 × 10 4
Yb-175 3.0 × 10 1 8.1 × 10 2 9.0 × 10−1 2.4 × 10 1 6.6 × 10 3 1.8 × 10 5
Zn-65 Zinc (30) 2.0 5.4 × 10 1 2.0 5.4 × 10 1 3.0 × 10 2 8.2 × 10 3
Zn-69 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 1.8 × 10 6 4.9 × 10 7
Zn-69m (a) 3.0 8.1 × 10 1 6.0 × 10−1 1.6 × 10 1 1.2 × 10 5 3.3 × 10 6
Zr-88 Zirconium (40) 3.0 8.1 × 10 1 3.0 8.1 × 10 1 6.6 × 10 2 1.8 × 10 4
Zr-93 Unlimited Unlimited Unlimited Unlimited 9.3 × 10−5 2.5 × 10−3
Zr-95 (a) 2.0 5.4 × 10 1 8.0 × 10−1 2.2 × 10 1 7.9 × 10 2 2.1 × 10 4
Zr-97 (a) 4.0 × 10−1 1.1 × 10 1 4.0 × 10−1 1.1 × 10 1 7.1 × 10 4 1.9 × 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; 85 FR 83401, Dec. 21, 2020]