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.
Appendix 16-A Index
| 
