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4731.3140 EXEMPT CONCENTRATIONS.

Subpart 1.

Parent isotope.

Many radioisotopes disintegrate into isotopes that are also radioactive. In expressing the concentrations in subpart 3, the activity stated is that of the parent isotope and takes into account the daughters.

Subp. 2.

Combination of isotopes.

For purposes of part 4731.3025, where a combination of isotopes is involved, the limit for the combination should be derived as follows: determine for each isotope in the product the ratio between the concentration present in the product and the exempt concentration established in subpart 3 for the specific isotope when not in combination. The sum of the ratios may not exceed one.

Concentration of isotope A
in product		 Concentration of isotope B
in product
__________________________ + __________________________ ≤ 1
Exempt concentration of
isotope A		 Exempt concentration of
isotope B

Subp. 3.

Exempt concentrations.

Column I Column II
Element
(atomic number)		 Isotope Gas concen-
tration
µCi/ml1		 Liquid and
solid concen-
tration µCi/ml2
_
Antimony (51) Sb 122 3 x 10-4
Sb 124 2 x 10-4
Sb 125 1 x 10-3
Argon (18) A 37 1 x 10-3
A 41 4 x10-7
Arsenic (33) As 73 5 x 10-3
As 74 5 x 10-4
As 76 2 x 10-4
As 77 8 x 10-4
Barium (56) Ba 131 2 x 10-3
Ba 140 3 x 10-4
Beryllium (4) Be 7 2 x 10-2
Bismuth (83) Bi 206 4 x 10-4
Bromine (35) Br 82 4 x 10-7 3 x 10-3
Cadmium (48) Cd 109 2 x 10-3
Cd 115m 3 x 10-4
Cd 115 3 x 10-4
Calcium (20) Ca 45 9 x 10-5
Ca 47 5 x 10-4
Carbon (6) C 14 1 x 10-6 8 x 10-3
Cerium (58) Ce 141 9 x 10-4
Ce 143 4 x 10-4
Ce 144 1 x 10-4
Cesium (55) Cs 131 2 x 10-2
Cs 134m 6 x 10-2
Cs 134 9 x 10-5
Chlorine (17) Cl 38 9 x 10-7 4 x 10-3
Chromium (24) Cr 51 2 x 10-2
Cobalt (27) Co 57 5 x 10-3
Co 58 1 x 10-3
Co 60 5 x 10-4
Copper (29) Cu 64 3 x 10-3
Dysprosium (66) Dy 165 4 x 10-3
Dy 166 4 x 10-4
Erbium (68) Er 169 9 x 10-4
Er 171 1 x 10-3
Europium (63) Eu 152 (T/2=9.2 hrs) 6 x 10-4
Eu 155 2 x 10-3
Fluorine (9) F 18 2 x 10-6 8 x 10-3
Gadolinium (64) Gd 153 2 x 10-3
Gd 159 8 x 10-4
Gallium (31) Ga 72 4 x 10-4
Germanium (32) Ge 71 2 x 10-2
Gold (79) Au 196 2 x 10-3
Au 198 5 x 10-4
Au 199 2 x 10-3
Hafnium (72) Hf 181 7 x 10-4
Hydrogen (1) H 3 5 x 10-6 3 x 10-2
Indium (49) In 113m 1 x 10-2
In 114m 2 x 10-4
Iodine (53) I 126 3 x 10-9 2 x 10-5
I 131 3 x 10-9 2 x 10-5
I 132 8 x 10-8 6 x 10-4
I 133 1 x 10-8 7 x 10-5
I 134 2 x 10-7 1 x 10-3
Iridium (77) Ir 190 2 x 10-3
Ir 192 4 x 10-4
Ir 194 3 x 10-4
Iron (26) Fe 55 8 x 10-3
Fe 59 6 x 10-4
Krypton (36) Kr 85m 1 x 10-6
Kr 85 3 x 10-6
Lanthanum (57) La 140 2 x 10-4
Lead (82) Pb 203 4 x 10-3
Lutetium (71) Lu 177 1 x 10-3
Manganese (25) Mn 52 3 x 10-4
Mn 54 1 x 10-3
Mn 56 1 x 10-3
Mercury (80) Hg 197m 2 x 10-3
Hg 197 3 x 10-3
Hg 203 2 x 10-4
Molybdenum (42) Mo 99 2 x 10-3
Neodymium (60) Nd 147 6 x 10-4
Nd 149 3 x 10-3
Nickel (28) Ni 65 1 x 10-3
Niobium (Columbium) (41) Nb 95 1 x 10-3
Nb 97 9 x 10-3
Osmium (76) Os 185 7 x 10-4
Os 191m 3 x 10-2
Os 191 2 x 10-3
Os 193 6 x 10-4
Palladium (46) Pd 103 3 x 10-3
Pd 109 9 x 10-4
Phosphorus (15) P 32 2 x 10-4
Platinum (78) Pt 191 1 x 10-3
Pt 193m 1 x 10-2
Pt 197m 1 x 10-2
Pt 197 1 x 10-3
Potassium (19) K 42 3 x 10-3
Praseodymium (59) Pr 142 3 x 10-4
Pr 143 5 x 10-4
Promethium (61) Pm 147 2 x 10-3
Pm 149 4 x 10-4
Rhenium (75) Re 183 6 x 10-3
Re 186 9 x 10-4
Re 188 6 x 10-4
Rhodium (45) Rh 103m 1 x 10-1
Rh 105 1 x 10-3
Rubidium (37) Rb 86 7 x 10-4
Ruthenium (44) Ru 97 4 x 10-4
Ru 103 8 x 10-4
Ru 105 1 x 10-3
Ru 106 1 x 10-4
Samarium (62) Sm 153 8 x 10-4
Scandium (21) Sc 46 4 x 10-4
Sc 47 9 x 10-4
Sc 48 3 x 10-4
Selenium (34) Se 75 3 x 10-3
Silicon (14) Si 31 9 x 10-3
Silver (47) Ag 105 1 x 10-3
Ag 110m 3 x 10-4
Ag 111 4 x 10-4
Sodium (11) Na 24 2 x 10-3
Strontium (38) Sr 85 1 x 10-3
Sr 89 1 x 10-4
Sr 91 7 x 10-4
Sr 92 7 x 10-4
Sulfur (16) S 35 9 x 10-8 6 x 10-4
Tantalum (73) Ta 182 4 x 10-4
Technetium (43) Tc 96m 1 x 10-1
Tc 96 1 x 10-3
Tellurium (52) Te 125m 2 x 10-3
Te 125m 6 x 10-4
Te 127 3 x 10-3
Te 129m 3 x 10-4
Te 131m 6 x 10-4
Te 132 3 x 10-4
Terbium (65) Tb 160 4 x 10-4
Thallium (81) Tl 200 4 x 10-3
Tl 201 3 x 10-3
Tl 202 1 x 10-3
Tl 204 1 x 10-3
Thulium (69) Tm 170 5 x 10-4
Tm 171 5 x 10-3
Tin (50) Sn 113 9 x 10-4
Sn 125 2 x 10-4
Tungsten (Wolfram) (74) W 181 4 x 10-3
W 187 7 x 10-4
Vanadium (23) V 48 3 x 10-4
Xenon (54) Xe 131m 4 x 10-6
Xe 133 3 x 10-6
Xe 135 1 x 10-6
Ytterbium (70) Yb 175 1 x 10-3
Yttrium (39) Y 90 2 x 10-4
Y 91m 3 x 10-2
Y 91 3 x 10-4
Y 92 6 x 10-4
Y 93 3 x 10-4
Zinc (30) Zn 65 1 x 10-3
Zn 69m 7 x 10-4
Zn 69 2 x 10-2
Zirconium (40) Zr 95 6 x 10-4
Zr 97 2 x 10-4
Beta- or gamma-
emitting radioactive
material not listed
above with half-life
less than three years		 1 x 10-10 1 x 10-6

1Values are given only for those materials normally used as gases.

2µCi/gm for solids.

Statutory Authority:

MS s 144.1202; 144.1203

History:

29 SR 755

Published Electronically:

March 12, 2009

Official Publication of the State of Minnesota
Revisor of Statutes