Minnesota Administrative Rules
Agency 144 - Health Department
Chapter 4731 - RADIATION SAFETY
DOMESTIC LICENSING OF RADIOACTIVE MATERIALS
Part 4731.3140 - EXEMPT CONCENTRATIONS

Universal Citation: MN Rules 4731.3140

Current through Register Vol. 49, No. 13, September 23, 2024

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
__________________________ + __________________________ <=
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 concentration 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.

2 µCi/gm for solids.

Statutory Authority: MS s 144.1202; 144.1203

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