Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 1000 - RADIATION HAZARDS › Subpart E - RECORDS › Appendix A - Concentrations in Air Above Natural Background

Current through Register Vol. 48, No. 28, July 12, 2024
Element (atomic number)
Isotope1
µCi/ml
Actinium (89)
AC 227
S
8 x 10-14
I
9 x 10-13
AC 228
S
3 x 10-9
I
6 x 10-10
Americium (95)
Am 241
S
2 x 10-13
I
4 x 10-12
Am 242m
S
2 x 10-13
I
9 x 10-12
Am 242
S
1 x 10-9
I
2 x 10-9
Am 243
S
2 x 10-13
I
4 x 10-12
Am 244
S
1 x 10-7
I
8 x 10-7
Antimony
Sb 122
S
6 x 10-9
I
5 x 10-9
Sb 124
S
5 x 10-9
I
7 x 10-10
Sb 125
S
2 x 10-8
I
9 x 10-10
Argon (18)
A 37
Sub2
1 x 10-4
A 41
Sub
4 x 10-8
Arsenic (33)
As 73
S
7 x 10-8
I
1 x 10-8
As 74
S
1 x 10-8
I
4 x 10-9
As 76
S
4 x 10-9
I
3 x 10-9
As 77
S
2 x 10-8
I
1 x 10-8
Astatine (85)
At 211
S
2 x 10-10
I
1 x 10-9
Barium (56)
Ba 131
S
4 x 10-8
I
1 x 10-8
Ba 140
S
4 x 10-9
I
1 x 10-9
Berkelium (97)
Bk 249
S
3 x 10-11
I
4 x 10-9
Bk 250
S
5 x 10-9
I
4 x 10-8
Berylium (4)
Be 7
S
2 x 10-7
I
4 x 10-8
Bismuth (83)
Bi 206
S
6 x 10-9
I
5 x 10-9
Bi 207
S
6 x 10-9
I
5 x 10-10
Bi 210
S
2 x 10-10
I
2 x 10-10
Bi 212
S
3 x 10-9
I
7 x 10-9
Bromine (35)
Br 82
S
4 x 10-8
I
6 x 10-9
Cadmium (48)
Cd 109
S
2 x 10-9
I
3 x 10-9
Cd 115m
S
1 x 10-9
I
1 x 10-9
Cd 115
S
8 x 10-9
I
6 x 10-9
Calcium (20)
Ca 45
S
1 x 10-9
I
4 x 10-9
Ca 47
S
6 x 10-9
I
6 x 10-9
Californium (98)
Cf 249
S
5 x 10-14
I
3 x 10-12
Cf 250
S
2 x 10-13
I
3 x 10-12
Cf 251
S
6 x 10-14
I
3 x 10-12
Cf 252
S
2 x 10-13
I
1 x 10-12
Cf 253
S
3 x 10-11
I
3 x 10-11
Cf 254
S
2 x 10-13
I
2 x 10-13
Carbon (6)
C 14
S
1 x 10-7
(CO2)
Sub
1 x 10-6
Cerium (58)
Ce 141
S
2 x 10-8
I
5 x 10-9
Ce 143
S
9 x 10-9
I
7 x 10-9
Ce 144
S
3 x 10-10
I
2 x 10-10
Cesium (55)
Cs 131
S
4 x 10-7
I
1 x 10-7
Cs 134m
S
1 x 10-6
I
2 x 10-7
Cs 134
S
1 x 10-9
I
4 x 10-10
Cs 135
S
2 x 10-8
I
3 x 10-9
Cs 136
S
1 x 10-8
I
6 x 10-9
Cs 137
S
2 x 10-9
I
5 x 10-10
Chlorine (17)
Cl 36
S
1 x 10-8
I
8 x 10-10
Cl 38
S
9 x 10-8
I
7 x 10-8
Chromium (24)
Cr 51
S
4 x 10-7
I
8 x 10-8
Cobalt (27)
Co 57
S
1 x 10-7
I
6 x 10-9
Co 58m
S
6 x 10-7
I
3 x 10-7
Co 58
S
3 x 10-8
I
2 x 10-9
Co 60
S
1 x 10-8
I
3 x 10-10
Copper (29)
Cu 64
S
7 x 10-8
I
4 x 10-8
Curium (96)
Cm 242
S
4 x 10-12
I
6 x 10-12
Cm 243
S
2 x 10-13
I
3 x 10-12
Cm 244
S
3 x 10-13
I
3 x 10-12
Cm 245
S
2 x 10-13
I
4 x 10-12
Cm 246
S
2 x 10-13
I
4 x 10-12
Cm 247
S
2 x 10-13
I
4 x 10-12
Cm 248
S
2 x 10-14
I
4 x 10-13
Cm 249
S
4 x 10-7
I
4 x 10-7
Dysprosium (66)
Dy 165
S
9 x 10-8
I
7 x 10-8
Dy 166
S
8 x 10-9
I
7 x 10-9
Einsteinium (99)
Es 253
S
3 x 10-11
I
2 x 10-11
Es 254m
S
2 x 10-10
I
2 x 10-10
Es 254
S
6 x 10-13
I
4 x 10-12
Es 255
S
2 x 10-11
I
1 x 10-11
Erbium (68)
Er 169
S
2 x 10-8
I
1 x 10-8
Er 171
S
2 x 10-8
I
2 x 10-8
Europium (63)
Eu 152
S
1 x 10-8
(T/2 =
							 9.2 hrs)
I
1 x 10-8
Eu 152
S
4 x 10-10
(T/2 = 13 yrs)
I
6 x 10-10
Eu 154
S
1 x 10-10
I
2 x 10-10
Eu 155
S
3 x 10-9
I
3 x 10-9
Fermium (100)
Fm 254
S
2 x 10-9
I
2 x 10-9
Fm 255
S
6 x 10-10
I
4 x 10-10
Fm 256
S
1 x 10-10
I
6 x 10-11
Fluorine (9)
F 18
S
2 x 10-7
I
9 x 10-8
Gadolinium (64)
Gd 153
S
8 x 10-9
I
3 x 10-9
Gd 159
S
2 x 10-8
I
1 x 10-8
Gallium (31)
Ga 72
S
8 x 10-9
I
6 x 10-9
Germanium (32)
Ge 71
S
4 x 10-7
I
2 x 10-7
Gold (79)
Au 196
S
4 x 10-8
I
2 x 10-8
Au 198
S
1 x 10-8
I
8 x 10-9
Au 199
S
4 x 10-8
I
3 x 10-8
Hafnium (72)
Hf 181
S
1 x 10-9
I
3 x 10-9
Holmium (67)
Ho 166
S
7 x 10-9
I
6 x 10-9
Hydrogen (1)
H3
S
2 x 10-7
I
2 x 10-7
Sub
4 x 10-5
Indium (49)
In 113m
S
3 x 10-7
I
2 x 10-7
In 114m
S
4 x 10-9
I
7 x 10-10
In 115m
S
8 x 10-8
I
6 x 10-8
In 115
S
9 x 10-9
I
1 x 10-9
Iodine (53)
I 125
S
8 x 10-11
I
6 x 10-9
I 126
S
9 x 10-11
I
1 x 10-8
I 129
S
2 x 10-11
I
2 x 10-9
I 131
S
1 x 10-10
I
1 x 10-8
I 132
S
3 x 10-9
I
3 x 10-8
I 133
S
4 x 10-10
I
7 x 10-9
I 134
S
6 x 10-9
I
1 x 10-7
I 135
S
1 x 10-9
I
1 x 10-8
Iridium (77)
Ir 190
S
4 x 10-8
I
1 x 10-8
Ir 192
S
4 x 10-9
I
9 x 10-10
Ir 194
S
8 x 10-9
I
5 x 10-9
Iron (26)
Fe 55
S
3 x 10-8
I
3 x 10-8
Fe 59
S
5 x 10-9
I
2 x 10-9
Krypton (36)
Kr 85m
Sub
1 x 10-7
Kr 85
Sub
3 x 10-7
Kr 87
Sub
2 x 10-8
Kr 88
Sub
2 x 10-8
Lanthanum (57)
La 140
S
5 x 10-9
I
4 x 10-9
Lead (82)
Pb 203
S
9 x 10-8
I
6 x 10-8
Pb 210
S
4 x 10-12
I
8 x 10-12
Pb 212
S
6 x 10-10
I
7 x 10-10
Lutetium (71)
Lu 177
S
2 x 10-8
I
2 x 10-8
Manganese (25)
Mn 52
S
7 x 10-9
I
5 x 10-9
Mn 54
S
1 x 10-8
I
1 x 10-9
Mn 56
S
3 x 10-8
I
2 x 10-8
Mercury (80)
Hg 197m
S
3 x 10-8
I
3 x 10-8
Hg 197
S
4 x 10-8
I
9 x 10-8
Hg 203
S
2 x 10-9
I
4 x 10-9
Molybdenum (42)
Mo 99
S
3 x 10-8
I
7 x 10-9
Neodymium (60)
Nd 144
S
3 x 10-12
I
1 x 10-11
Nd 147
S
1 x 10-8
I
8 x 10-9
Nd 149
S
6 x 10-8
I
5 x 10-8
Neptunium (93)
Np 237
S
1 x 10-13
I
4 x 10-12
Np 239
S
3 x 10-8
I
2 x 10-8
Nickel (28)
Ni 59
S
2 x 10-8
I
3 x 10-8
Ni 63
S
2 x 10-9
I
1 x 10-8
Ni 65
S
3 x 10-8
I
2 x 10-8
Niobium (Columbium) (41)
Nb 93m
S
4 x 10-9
I
5 x 10-9
Nb 95
S
2 x 10-8
I
3 x 10-9
Nb 97
S
2 x 10-7
I
2 x 10-7
Osmium (76)
Os 185
S
2 x 10-8
I
2 x 10-9
Os 191m
S
6 x 10-7
I
3 x 10-7
Os 191
S
4 x 10-8
I
1 x 10-8
Os 193
S
1 x 10-8
I
9 x 10-9
Palladium (46)
Pd 103
S
5 x 10-8
I
3 x 10-8
Pd 109
S
2 x 10-8
I
1 x 10-8
Phosphorus (15)
P 32
S
2 x 10-9
I
3 x 10-9
Platinum (78)
Pt 191
S
3 x 10-8
I
2 x 10-8
Pt 193m
S
2 x 10-7
I
2 x 10-7
Pt 193
S
4 x 10-8
I
1 x 10-8
Pt 197m
S
2 x 10-7
I
2 x 10-7
Pt 197
S
3 x 10-8
I
2 x 10-8
Plutonium (94)
Pu 238
S
7 x 10-14
I
1 x 10-12
Pu 239
S
6 x 10-14
I
1 x 10-12
Pu 240
S
6 x 10-14
I
1 x 10-12
Pu 241
S
3 x 10-12
I
1 x 10-9
Pu 242
S
6 x 10-14
I
1 x 10-12
Pu 243
S
6 x 10-8
I
8 x 10-8
Pu 244
S
6 x 10-14
I
1 x 10-12
Polonium (84)
Po 210
S
2 x 10-11
I
7 x 10-12
Potassium (19)
K 42
S
7 x 10-8
I
4 x 10-9
Praseodymium (59)
Pr 142
S
7 x 10-9
I
5 x 10-9
Pr 143
S
1 x 10-8
I
6 x 10-9
Promethium (61)
Pm 147
S
2 x 10-9
I
3 x 10-9
Pm 149
S
1 x 10-8
I
8 x 10-9
Protoactinium (91)
Pa 230
S
6 x 10-11
I
3 x 10-11
Pa 231
S
4 x 10-14
I
4 x 10-12
Pa 233
S
2 x 10-8
I
6 x 10-9
Radium (88)
Ra 223
S
6 x 10-11
I
8 x 10-12
Ra 224
S
2 x 10-10
I
2 x 10-11
Ra 226
S
3 x 10-12
I
2 x 10-12
Ra 228
S
2 x 10-12
I
1 x 10-12
Radon (86)
Rn 220
S
1 x 10-8
Rn 2223
I
3 x 10-9
Rhenium (75)
Re 183
S
9 x 10-8
I
5 x 10-9
Re 186
S
2 x 10-8
I
8 x 10-9
Re 187
S
3 x 10-7
I
2 x 10-8
Re 188
S
1 x 10-8
I
6 x 10-9
Rhodium (45)
Rh 103m
S
3 x 10-6
I
2 x 10-6
Rh 105
S
3 x 10-8
I
2 x 10-8
Rubidium (37)
Rb 86
S
1 x 10-8
I
2 x 10-9
Rb 87
S
2 x 10-8
I
2 x 10-9
Ruthenium (44)
Ru 97
S
8 x 10-8
I
6 x 10-8
Ru 103
S
2 x 10-8
I
3 x 10-9
Ru 105
S
2 x 10-8
I
2 x 10-8
Ru 106
S
3 x 10-9
I
2 x 10-10
Samarium (62)
Sm 147
S
2 x 10-12
I
9 x 10-12
Sm 151
S
2 x 10-9
I
5 x 10-9
Sm 153
S
2 x 10-8
I
1 x 10-8
Scandium (21)
Sc 46
S
8 x 10-9
I
8 x 10-10
Sc 47
S
2 x 10-8
I
2 x 10-8
Sc 48
S
6 x 10-9
I
5 x 10-9
Selenium (34)
Se 75
S
4 x 10-8
I
4 x 10-9
Silicon (14)
Si 31
S
2 x 10-7
I
3 x 10-8
Silver (47)
Ag 105
S
2 x 10-8
I
3 x 10-9
Ag 110m
S
7 x 10-9
I
3 x 10-10
Ag 111
S
1 x 10-8
I
8 x 10-9
Sodium (11)
Na 22
S
6 x 10-9
I
3 x 10-10
Na 24
S
4 x 10-8
I
5 x 10-9
Strontium (38)
Sr 85m
S
1 x 10-6
I
1 x 10-6
Sr 85
S
8 x 10-9
I
4 x 10-9
Sr 89
S
3 x 10-10
I
1 x 10-9
Sr 90
S
3 x 10-11
I
2 x 10-10
Sr 91
S
2 x 10-8
I
9 x 10-9
Sr 92
S
2 x 10-8
I
1 x 10-8
Sulfur (16)
S 35
S
9 x 10-9
I
9 x 10-9
Tantalum (73)
Ta 182
S
1 x 10-9
I
7 x 10-10
Technetium (43)
Tc 96m
S
3 x 10-6
I
1 x 10-6
Tc 96
S
2 x 10-8
I
8 x 10-9
Tc 97m
S
8 x 10-8
I
5 x 10-9
Tc 97
S
4 x 10-7
I
1 x 10-8
Tc 99m
S
1 x 10-6
I
5 x 10-7
Tc 99
S
7 x 10-8
I
2 x 10-9
Tellurium (52)
Te 125m
S
1 x 10-8
I
4 x 10-9
Te 127m
S
5 x 10-9
I
1 x 10-9
Te 127
S
6 x 10-8
I
3 x 10-8
Te 129m
S
3 x 10-9
I
1 x 10-9
Te 129
S
2 x 10-7
I
1 x 10-7
Te 131m
S
1 x 10-8
I
6 x 10-9
Te 132
S
7 x 10-9
I
4 x 10-9
Terbium (65)
Tb 160
S
3 x 10-9
I
1 x 10-9
Thallium (81)
Tl 200
S
9 x 10-8
I
4 x 10-8
Tl 201
S
7 x 10-8
I
3 x 10-8
Tl 202
S
3 x 10-8
I
8 x 10-9
Tl 204
S
2 x 10-8
I
9 x 10-10
Thorium (90)
Th 227
S
1 x 10-11
I
6 x 10-12
Th 228
S
3 x 10-13
I
2 x 10-13
Th 230
S
8 x 10-14
I
3 x 10-13
Th 231
S
5 x 10-8
I
4 x 10-8
Th 232
S
1 x 10-12
I
1 x 10-12
Th natural
S
2 x 10-12
I
2 x 10-12
Th 234
S
2 x 10-9
I
1 x 10-9
Thulium (69)
Tm 170
S
1 x 10-9
I
1 x 10-9
Tm 171
S
4 x 10-9
I
8 x 10-9
Tin (50)
Sn 113
S
1 x 10-8
I
2 x 10-9
Sn 125
S
4 x 10-9
I
3 x 10-9
Tungsten (Wolfram) (74)
W 181
S
8 x 10-8
I
4 x 10-9
W 185
S
3 x 10-8
I
4 x 10-9
W 187
S
2 x 10-8
I
1 x 10-8
Uranium (92)
U 230
S
1 x 10-11
I
4 x 10-12
U 232
S
3 x 10-12
I
9 x 10-13
U 233
S
2 x 10-11
I
4 x 10-12
U 234
S4
2 x 10-11
I
4 x 10-12
U 235
S4
2 x 10-11
I
4 x 10-12
U 236
S
2 x 10-11
I
4 x 10-12
U 238
S4
3 x 10-12
I
5 x 10-12
U 240
S
8 x 10-9
I
6 x 10-9
U-natural
S4
5 x 10-12
I
5 x 10-12
Vanadium (23)
V 48
S
6 x 10-9
I
2 x 10-9
Xenon (54)
Xe 131m
Sub
4 x 10-7
Xe 133
Sub
3 x 10-7
Xe 133m
Sub
3 x 10-7
Xe 135
Sub
1 x 10-7
Ytterbium (70)
Yb 175
S
2 x 10-8
I
2 x 10-8
Yttrium (39)
Y 90
S
4 x 10-9
I
3 x 10-9
Y 91m
S
8 x 10-7
I
6 x 10-7
Y 91
S
1 x 10-9
I
1 x 10-9
Y 92
S
1 x 10-8
I
1 x 10-8
Y 93
S
6 x 10-9
I
5 x 10-9
Zinc (30)
Zn 65
S
4 x 10-9
I
2 x 10-9
Zn 69m
S
1 x 10-8
I
1 x 10-8
Zn 69
S
2 x 10-7
I
3 x 10-7
Zirconium (40)
Zr 93
S
4 x 10-9
I
1 x 10-8
Zr 95
S
4 x 10-9
I
1 x 10-9
Zr 97
S
4 x 10-9
I
3 x 10-9
Any single radionuclide not listed above with decay
							 mode other than alpha emission or spontaneous fission and with radioactive
							 half-life less than 2 hours.
Sub
3 x 10-6
Any single radionuclide not listed above with decay
							 mode other than alpha emission or spontaneous fission and with radioactive
							 half-life greater than 2 hours.
1 x 10-10
Any single radionuclide not listed above, that decays
							 by alpha emission or spontaneous fission.
2 x 10-14
1Soluble (S); Insoluble
				  (I).
2"Sub" means that values given are
				  for submersion in a semispherical infinite cloud of airborne material.
3These radon concentrations are
				  appropriate for protection from radon-222 combined with its short-lived
				  daughters. The value may be replaced by one-thirtieth (1/30) of a "working
				  level." A "working level" is defined as any combination of short-lived
				  radon-222 daughters, polonium-218, lead-214, bismuth-214 and polonium-214, in
				  one liter of air, without regard to the degree of equilibrium, that will result
				  in the ultimate emission of
				  1.3 x
				  105 MeV of alpha particle energy.
4For soluble mixtures of U-238,
				  U-234 and U-235 in air chemical toxicity may be the limiting factor. The
				  concentration value is
				  0.007 milligrams of uranium per
				  cubic meter of air. The specific activity for natural uranium is
				  6.77 x
				  10-7 curies per gram U. The specific activity (SA)
				  for other mixtures of U-238, U-235 and U-234, if not known, will be:
SA =
				  3.6 x
				  10-7 curies/gram U........... U-depleted
SA = (0.4 +
				  0.38 E +
				  0.0034
				  E2)
				  10-6................................................
				  E [GREATER THAN OR EQUAL TO]
				  0.72
where E is the percentage by weight of U-235, expressed as a
				  percent.
NOTE: When a mixture in air of more than one radionuclide
				  exists, the limiting values of this Appendix should be determined as
				  follows:
1. If the identity and concentration of each radionuclide in
				  the mixture are known, the limiting values should be derived as follows:
				  Determine, for each radionuclide in the mixture, the ratio between the quantity
				  present in the mixture and the limit otherwise established in Appendix A for
				  the specific radionuclide when not in a mixture. The sum of the ratios for all
				  the radionuclides in the mixture may not exceed "1" (i.e., "unity").
EXAMPLE: If radionuclides A, B, and C are present in
				  concentrations CA, CB,
				  CC, and if the applicable MPCs are
				  MPCA, and MPCB, and
				  MPCC respectively, then the concentrations must be
				  limited so that the following relationship exists:
(CA/MPCA) +
				  (CB/MPCB) +
				  (CC/MPCC) [LESS THAN OR EQUAL TO]
				  1
2. If either the identity or the concentration of any
				  radionuclide in the mixture is not known, the limiting values of Appendix A
				  must be 2 x 10-14.
3. If any of the conditions specified below are met, the
				  corresponding values specified below may be used instead of those specified in
				  paragraph 2 above.
a. If the identity of each radionuclide in the mixture is
				  known but the concentration of one or more of the radionuclides in the mixture
				  is not known, the concentration limit for the mixture is the limit specified in
				  Appendix A for the radionuclide in the mixture having the lowest concentration
				  limit; or
b. If the identity of each radionuclide in the mixture is not
				  known but it is known that radionuclides specified in Appendix A are not
				  present in the mixture, the concentration limit for the mixture is the lowest
				  concentration limit specified in Appendix A for any radionuclide that is not
				  known to be absent from the mixture; or
c. Element (atomic number) and isotope. µCi/ml
If it is known that alpha-emitters and Sr 90, I 129,
							 Pb 210, Ac 227, Ra 228, Pa 230, Pu 241, and Bk 249 are not present.
1 x 10-10
If it is known that alpha-emitters and Pb 210, Ac
							 227, Ra 228, and Pu 241 are not present.
1 x 10-11
If it is known that alpha-emitters and Ac 227 are not
							 present.
1 x 10-12
If it is known that Ac 227, Th 230, Pa 231, Pu 238,
							 Pu 239, Pu 240, Pu 242, Pu 244, Cm 248, Cf 249 and Cf 251 are not
							 present.
1 x 10-13
4. If a mixture of radionuclides consists of uranium and its
				  daughters in ore dust before chemical separation of the uranium from the ore,
				  the following values may be used for uranium and its daughters through
				  radium-226, instead of those from paragraphs 1, 2, or 3 above:
3 x 10-12 µCi/ml gross alpha activity; 2 x 10-12
				  µCi/ml natural uranium; or 3 micrograms per cubic meter of air natural
				  uranium.
5. For this note, a radionuclide may be considered as not
				  present in a mixture if:
a. the ratio of the concentration of that radionuclide in the
				  mixture (CA) to the concentration limit for that
				  radionuclide specified in Appendix A (MPCA) does not
				  exceed 1/10 (i.e., CA/MPCA [LESS
				  THAN OR EQUAL TO] 1/10), and
b. the sum of such ratios for all the radionuclides
				  considered as not present in the mixtures does not exceed 1/4, (i.e.,
				  (CA/MPCA +
				  CB/MPCB + ... [LESS THAN OR EQUAL
				  TO] 1/4).