Table 1—A1 and A2 Values for Radionuclides

Table 1 A1 and A2 Values for Radionuclides (See footnotes at end of Table)

Symbol of Radionuclide Element and Atomic number A1 (Ci) A2 (Ci) Specific Activity (Ci/g)
Ac-227 Actinium (89) 1000 0.003 7.2 E+01
Ac-228   10 4 2.2 E+06
Ag-105 Silver (47) 40 40 3.0 E+07
Ag-110m   7 7 4.7 E+03
Ag-111   100 20 1.5 E+05
Am-241 Americium (95) 8 0.008 3.2
Am-243   8 0.008 1.9 E-01
Ar-37 (compressed or Argon (18) 1000 1000 1.0 E+05
uncompressed)*        
Ar-41 (uncompressed)*   20 20 4.3 E+07
Ar-41 (compressed)*   1 1 4.3 E+07
As-73 Arsenic (33) 1000 400 2.4 E+04
As-74   20 20 1.0 E+05
As-76   10 10 1.6 E+06
As-77   300 20 1.1 E+06
At-211 Astatine (85) 200 7 2.1 E+06
Au-193 Gold (79) 200 200 9.3 E+05
Au-196   30 30 1.2 E+05
Au-198   40 20 2.5 E+05
Au-199   200 25 2.1 E+05
Ba-131 Barium (56) 40 40 8.7 E+04
Ba-133   40 40 4.0 E+03
Ba-140   20 20 7.3 E+04
Be-7 Beryllium (4) 300 300 3.5 E+05
Bi-206 Bismuth (83) 5 5 9.9 E+04
Bi-207   10 10 2.2 E+02
Bi-210 (RaE)   100 4 1.2 E+05
Bi-212   6 6 1.5 E+07
Bk-249 Berkelium (97) 1000 1 1.8 E+03
Br-77 Bromine (35) 70 25 7.1 E+03
Br-82   6 6 1.1 E+06
C-11 Carbon (6) 20 20 8.4 E+08
C-14   1000 60 4.6
Ca-45 Calcium (20) 1000 25 1.9 E+04
Ca-47   20 20 5.9 E+05
Cd-109 Cadmium (48) 1000 70 2.6 E+03
Cd-115m   30 30 2.6 E+04
Cd-115   80 20 5.1 E+05
Ce-139 Cerium (58) 100 100 6.5 E+03
Ce-141   300 25 2.8 E+04
Ce-143   60 20 6.6 E+05
Ce-144   10 7 3.2 E+03
Cf-249 Californium (98) 2 0.002 3.1
Cf-250   7 0.007 1.3 E+02
Cf-252   2 0.009 6.5 E+02
Cl-36 Chlorine (17) 300 10 3.2 E-02
Cl-38   10 10 1.3 E+08
Cm-242 Curium (96) 200 0.2 3.3 E+03
Cm-243   9 0.009 4.2 E+01
Cm-244   10 0.01 8.2 E+01
Cm-245   6 0.006 1.0 E-01
Cm-246   6 0.006 3.6 E-01
Co-56 Cobalt (27) 5 5 3.0 E+04
Co-57   90 90 8.5 E+03
Co-58m   1000 1000 5.9 E+06
Co-58   20 20 3.1 E+05
Co-60   7 7 1.1 E+03
Cr-51 Chromium (24) 600 600 9.2 E+04
Cs-129 Cesium (55) 40 40 7.6 E+05
Cs-131   1000 1000 1.1 E+05
Cs-134m   1000 10 7.4 E+06
Cs-134   10 10 1.2 E+03
Cs-135   1000 25 8.8 E-04
Cs-136   7 7 7.4 E+04
Cs-137   30 10 9.8 E+01
Cu-64 Copper (29) 80 25 3.8 E+06
Cu-67   200 25 7.9 E+05
Dy-165 Dysprosium (66) 100 20 8.2 E+06
Dy-166   1000 200 2.3 E+05
Er-169 Erbium (68) 1000 25 8.2 E+04
Er-171   50 20 2.4 E+06
Eu-152m Europium (63) 30 30 2.2 E+06
Eu-152   20 10 1.9 E+02
Eu-154   10 5 1.5 E+02
Eu-155   400 60 1.4 E+03
F-18 Fluorine (9) 20 20 9.3 E+07
Fe-52 Iron (26) 5 5 7.3 E+06
Fe-55   1000 1000 2.2 E+03
Fe-59   10 10 4.9 E+04
Ga-67 Gallium (31) 100 100 6.0 E+03
Ga-68   20 20 4.0 E+07
Ga-72   7 7 3.1 E+06
Gd-153 Gadolinium (64) 200 100 3.6 E+03
Gd-159   300 20 1.1 E+06
Ge-68 Germanium (32) 20 10 7.0 E+03
Ge-71   1000 1000 1.6 E+05
H-3 Hydrogen (1) see Tritium    
Hf-181 Hafnium (72) 30 25 1.6 E+04
Hg-197m Mercury (80) 200 200 6.6 E+05
Hg-197   200 200 2.5 E+05
Hg-203   80 25 1.4 E+04
Ho-166 Holmium(67) 30 30 6.9 E+05
I-123 Iodine (53) 50 50 6.9 E+04
I-125   1000 70 1.7 E+04
I-126   40 10 7.8 E+04
I-129   1000 2 1.6 E-04
I-131   40 1 1.2 E+05
I-132   7 7 1.1 E+07
I-133   30 10 1.1 E+06
I-134   8 8 2.7 E+07
I-135   10 10 3.5 E+06
In-111 Indium (49) 30 25 4.2 E+05
In-113m   60 60 1.6 E+07
In-114m   30 20 2.3 E+04
In-115m   100 20 6.1 E+06
Ir-190 Iridium (77) 10 10 6.2 E+04
Ir-192   20 10 9.1 E+03
Ir-194   10 10 8.5 E+05
K-42 Potassium (19) 10 10 6.0 E+06
K-43   20 10 3.3 E+06
Kr-85m (uncompressed)* Krypton (36) 100 100 8.4 E+06
Kr-85m (compressed)*   3 3 8.4 E+06
Kr-85 (uncompressed)*   1000 1000 4.0 E+02
Kr-85 (compressed)*   5 5 4.0 E+02
Kr-87 (uncompressed)*   20 20 2.8 E+07
Kr-87 (compressed)*   0.6 0.6 2.8 E+07
La-140 Lanthanum (57) 30 30 5.6 E+05
Lu-177 Lutetium (71) 300 25 1.1 E+05
MFP Mixed Fission Products 10 0.4 ---
Mg-28 Magnesium (12) 6 6 5.2 E+06
Mn-54   20 20 8.3 E+03
Mn-56   5 5 2.2 E+07
Mo-99 Molybdenum (42) 100 20 4.7 E+05
N-13 Nitrogen (7) 20 10 1.5 E+09
Na-22 Sodium (11) 8 8 6.3 E+03
Na-24   5 5 8.7 E+06
Nb-93m Niobium (41) 1000 200 4.1 E+02
Nb-95   20 20 3.9 E+04
Nb-97   20 20 2.6 E+07
Nd-147 Neodymium (60) 100 20 8.0 E+04
Nd-149   30 20 1.1 E+07
Ni-59 Nickel (28) 1000 900 8.1 E-02
Ni-63   1000 100 4.6 E+01
Ni-65   10 10 1.9 E+07
Np-237 Neptunium (93) 5 0.005 6.9 E-04
Np-239   200 25 2.3 E+05
Os-185 Osmium (76) 20 20 7.3 E+03
Os-191   600 200 4.6 E+04
Os-191m   200 200 1.2 E+06
Os-193   100 20 5.3 E+05
P-32 Phosphorus (15) 30 30 2.9 E+05
Pa-230 Protactinium (91) 20 0.8 3.2 E+04
Pa-231   2 0.002 4.5 E-02
Pa-233   100 100 2.1 E+04
Pb-201 Lead (82) 20 20 1.7 E+06
Pb-210   100 0.2 8.8 E+01
Pb-212   6 5 1.4 E+06
Pd-103 Palladium (46) 1000 700 7.5 E+04
Pd-109   100 20 2.1 E+06
Pm-147 Promethium (61) 1000 25 9.4 E+02
Pm-149   100 20 4.2 E+05
Po-210 Polonium (84) 200 0.2 4.5 E+03
Pr-142 Praseodymium (59) 10 10 1.2 E+06
Pr-143   300 20 6.6 E+04
Pt-191 Platinum (78) 100 100 2.3 E+05
Pt-193m   200 200 2.0 E+05
Pt-197m   300 20 1.2 E+07
Pt-197   300 20 8.8 E+05
Pu-238 Plutonium (94) 3 0.003 1.7 E+01
Pu-239   2 0.002 6.2 E-02
Pu-240   2 0.002 2.3 E-01
Pu-241   1000 0.1 1.1 E+02
Pu-242   3 0.003 3.9 E-03
Ra-223 Radium (88) 50 0.2 5.0 E+04
Ra-224   6 0.5 1.6 E+05
Ra-226   10 0.05 1.0
Ra-228   10 0.05 2.3 E+02
Rb-81 Rubidium (37) 30 24 8.2 E+04
Rb-87   Unlimited Unlimited 6.6 E-08
Rb (natural)   Unlimited Unlimited 1.8 E-08
Re-186 Rhenium (75) 100 20 1.9 E+05
Re-187   Unlimited Unlimited 3.8 E-08
Re (natural)   Unlimited Unlimited 2.4 E-08
Rh-103m Rhodium (45) 1000 1000 3.2 E+07
Rh-105   200 25 8.2 E+05
Rn-222 Radon (86)   2 1.5 E+05
Ru-97 Ruthenium (44) 80 80 5.5 E+05
Ru-103   30 25 3.2 E+04
Ru-105   20 20 6.6 E+06
Ru-106   10 7 3.4 E+03
S-35 Sulphur (16) 1000 60 4.3 E+04
Sb-122 Antimony (51) 30 30 3.9 E+05
Sb-124   5 5 1.8 E+04
Sb-125   40 25 1.4 E+03
Sc-46 Scandium (21) 8 8 3.4 E+04
Sc-47   200 20 8.2 E+05
Sc-48   5 5 1.5 E+06
Se-75 Selenium (34) 40 40 1.4 E+04
Si-31 Silicon (14) 100 20 3.9 E+07
Sm-147 Samarium (62) Unlimited Unlimited 2.0 E-08
Sm-151   1000 90 2.6 E+01
Sm-153   300 20 4.4 E+05
Sn-119m   100 100 4.4 E+03
Sn-125   10 10 1.1 E+05
Sr-85m Strontium (38) 80 80 3.2 E+07
Sr-85   30 30 2.4 E+04
Sr-89   100 10 2.9 E+04
Sr-90   10 0.4 1.5 E+02
Sr-91   10 10 3.6 E+06
Sr-92   10 10 1.3 E+07
T (uncompressed)* Tritium (1) 1000 1000 9.7 E+03
T (compressed)*   1000 1000 9.7 E+03
T (activated luminous paint)   1000 1000 9.7 E+03
T (adsorbed on solid carrier)   1000 1000 9.7 E+03
T (tritiated water)   1000 1000 9.7 E+03
T (other forms)   20 20 9.7 E+03
Ta-182 Tantalum (73) 20 20 6.2 E+03
Tb-182 Terbium (65) 20 10 1.1 E+05
Tc-96m Technetium (43) 1000 1000 3.8 E+07
Tc-96   6 6 3.2 E+05
Tc-97m   1000 200 1.5 E+04
Tc-97   1000 400 1.4 E+04
Tc-99m   100 100 5.2 E+06
Tc-99   1000 25 1.7 E-02
Te-125m Tellurium (52) 1000 100 1.8 E+04
Te-127m   300 20 4.0 E+04
Te-127   300 20 2.6 E+06
Te-129m   30 10 2.5 E+04
Te-129   100 20 2.0 E+07
Te-131m   10 10 8.0 E+05
Te-132   7 7 3.1 E+05
Th-227 Thorium (90) 200 0.2 3.2 E+04
Th-228   6 0.008 8.3 E+02
Th-230   3 0.003 1.9 E-02
Th-231   1000 25 5.3 E+05
Th-232   Unlimited Unlimited 1.1 E-07
Th-234   10 10 2.3 E+04
Th (natural)   Unlimited Unlimited 2.2 E-07
Th (irradiated)**   --- --- ---
Tl-200 Thallium (81) 20 20 5.8 E+05
Tl-201   200 200 2.2 E+05
Tl-202   40 40 5.4 E+04
Tl-204   300 10 4.3 E+02
Tm-170 Thulium (69) 300 10 6.0 E+03
Tm-171   1000 100 1.1 E+03
U-230 Uranium (92) 100 0.1 2.7 E+04
U-232   30 0.03 2.1 E+01
U-233   100 0.1 9.5 E-03
U-234   100 0.1 6.2 E-03
U-235   100 0.2 2.1 E-06
U-238   Unlimited Unlimited 3.3 E-07
U (natural)   Unlimited Unlimited (see Table 4)
U (enriched) < 20%   Unlimited Unlimited (see Table 4)
U (enriched) 20% or greater   Unlimited Unlimited (see Table 4)
U (depleted)   Unlimited   (see Table IV)
U (irradiated)***   --- --- ---
V-48 Vanadium (23) 6 6 1.7 E+05
W-181 Tungsten (74) 200 100 5.0 E+03
W-185   1000 25 9.7 E+03
W-187   40 20 7.0 E+05
Xe-127 (uncompressed)* Xenon (54) 70 70 2.8 E+04
Xe-127 (compressed)*   5 5 2.8 E+04
Xe-131m (compressed)*   10 10 1.0 E+05
Xe-131m (uncompressed)*   100 100 1.0 E+05
Xe-133 (uncompressed)*   1000 1000 1.9 E+05
Xe-133 (compressed)*   5 5 1.9 E+05
Xe-135 (uncompressed)*   70 70 2.5 E+06
Xe-135 (compressed)*   2 2 2.5 E+06
Y-87 Yttrium (39) 20 20 4.5 E+05
Y-90   10 10 5.4 E+05
Y-91m   30 30 4.1 E+07
Y-91   30 30 2.5 E+04
Y-92   10 10 9.5 E+06
Y-93   10 10 3.2 E+06
Yb-169 Ytterbium (70) 80 80 2.3 E+05
Yb-175   400 25 1.8 E+05
Zn-65 Zinc (30) 30 30 8.0 E+03
Zn-69m   40 20 3.3 E+06
Zn-69   300 20 5.3 E+07
Zr-93 Zirconium (40) 1000 200 3.5 E-03
Zr-95   20 20 2.1 E+04
Zr-97   20 20 2.0 E+06

* For the purpose of Table 1, compressed gas means a gas at a pressure which exceeds the ambient atmospheric pressure at the location where the containment system was closed.

** The values of A1 and A2 must be calculated in accordance with the procedure specified in Appendix 16-B, paragraph II 3., taking into account the activity of the fission products and of the uranium-233 in addition to that of the thorium.

*** The values of A1 and A2 must be calculated in accordance with the procedure specified in Appendix 16-B, paragraph II 3., taking into account the activity of the fission products and plutonium isotopes in addition to that of the uranium.