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

Minn. R. agency 144, ch. 4731, DOMESTIC LICENSING OF RADIOACTIVE MATERIALS, pt. 4731.3140

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Current through Register Vol. 49, No. 17, October 21, 2024
Part 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 productConcentration of isotope B in product
__________________________+__________________________<=
Exempt concentration of isotope AExempt concentration of isotope B

Subp. 3.Exempt concentrations.

Column IColumn II
Element (atomic number)IsotopeGas concen- tration µCi/ml1Liquid and solid concentration µCi/ml2
_____
Antimony (51)Sb 1223 x 10-4
Sb 1242 x 10-4
Sb 1251 x 10-3
Argon (18)A 371 x 10-3
A 414 x10-7
Arsenic (33)As 735 x 10-3
As 745 x 10-4
As 762 x 10-4
As 778 x 10-4
Barium (56)Ba 1312 x 10-3
Ba 1403 x 10-4
Beryllium (4)Be 72 x 10-2
Bismuth (83)Bi 2064 x 10-4
Bromine (35)Br 824 x 10-73 x 10-3
Cadmium (48)Cd 1092 x 10-3
Cd 115m3 x 10-4
Cd 1153 x 10-4
Calcium (20)Ca 459 x 10-5
Ca 475 x 10-4
Carbon (6)C 141 x 10-68 x 10-3
Cerium (58)Ce 1419 x 10-4
Ce 1434 x 10-4
Ce 1441 x 10-4
Cesium (55)Cs 1312 x 10-2
Cs 134m6 x 10-2
Cs 1349 x 10-5
Chlorine (17)Cl 389 x 10-74 x 10-3
Chromium (24)Cr 512 x 10-2
Cobalt (27)Co 575 x 10-3
Co 581 x 10-3
Co 605 x 10-4
Copper (29)Cu 643 x 10-3
Dysprosium (66)Dy 1654 x 10-3
Dy 1664 x 10-4
Erbium (68)Er 1699 x 10-4
Er 1711 x 10-3
Europium (63)Eu 152 (T/2=9.2 hrs)6 x 10-4
Eu 1552 x 10-3
Fluorine (9)F 182 x 10-68 x 10-3
Gadolinium (64)Gd 1532 x 10-3
Gd 1598 x 10-4
Gallium (31)Ga 724 x 10-4
Germanium (32)Ge 712 x 10-2
Gold (79)Au 1962 x 10-3
Au 1985 x 10-4
Au 1992 x 10-3
Hafnium (72)Hf 1817 x 10-4
Hydrogen (1)H 35 x 10-63 x 10-2
Indium (49)In 113m1 x 10-2
In 114m2 x 10-4
Iodine (53)I 1263 x 10-92 x 10-5
I 1313 x 10-92 x 10-5
I 1328 x 10-86 x 10-4
I 1331 x 10-87 x 10-5
I 1342 x 10-71 x 10-3
Iridium (77)Ir 1902 x 10-3
Ir 1924 x 10-4
Ir 1943 x 10-4
Iron (26)Fe 558 x 10-3
Fe 596 x 10-4
Krypton (36)Kr 85m1 x 10-6
Kr 853 x 10-6
Lanthanum (57)La 1402 x 10-4
Lead (82)Pb 2034 x 10-3
Lutetium (71)Lu 1771 x 10-3
Manganese (25)Mn 523 x 10-4
Mn 541 x 10-3
Mn 561 x 10-3
Mercury (80)Hg 197m2 x 10-3
Hg 1973 x 10-3
Hg 2032 x 10-4
Molybdenum (42)Mo 992 x 10-3
Neodymium (60)Nd 1476 x 10-4
Nd 1493 x 10-3
Nickel (28)Ni 651 x 10-3
Niobium (Columbium) (41)Nb 951 x 10-3
Nb 979 x 10-3
Osmium (76)Os 1857 x 10-4
Os 191m3 x 10-2
Os 1912 x 10-3
Os 1936 x 10-4
Palladium (46)Pd 1033 x 10-3
Pd 1099 x 10-4
Phosphorus (15)P 322 x 10-4
Platinum (78)Pt 1911 x 10-3
Pt 193m1 x 10-2
Pt 197m1 x 10-2
Pt 1971 x 10-3
Potassium (19)K 423 x 10-3
Praseodymium (59)Pr 1423 x 10-4
Pr 1435 x 10-4
Promethium (61)Pm 1472 x 10-3
Pm 1494 x 10-4
Rhenium (75)Re 1836 x 10-3
Re 1869 x 10-4
Re 1886 x 10-4
Rhodium (45)Rh 103m1 x 10-1
Rh 1051 x 10-3
Rubidium (37)Rb 867 x 10-4
Ruthenium (44)Ru 974 x 10-4
Ru 1038 x 10-4
Ru 1051 x 10-3
Ru 1061 x 10-4
Samarium (62)Sm 1538 x 10-4
Scandium (21)Sc 464 x 10-4
Sc 479 x 10-4
Sc 483 x 10-4
Selenium (34)Se 753 x 10-3
Silicon (14)Si 319 x 10-3
Silver (47)Ag 1051 x 10-3
Ag 110m3 x 10-4
Ag 1114 x 10-4
Sodium (11)Na 242 x 10-3
Strontium (38)Sr 851 x 10-3
Sr 891 x 10-4
Sr 917 x 10-4
Sr 927 x 10-4
Sulfur (16)S 359 x 10-86 x 10-4
Tantalum (73)Ta 1824 x 10-4
Technetium (43)Tc 96m1 x 10-1
Tc 961 x 10-3
Tellurium (52)Te 125m2 x 10-3
Te 125m6 x 10-4
Te 1273 x 10-3
Te 129m3 x 10-4
Te 131m6 x 10-4
Te 1323 x 10-4
Terbium (65)Tb 1604 x 10-4
Thallium (81)Tl 2004 x 10-3
Tl 2013 x 10-3
Tl 2021 x 10-3
Tl 2041 x 10-3
Thulium (69)Tm 1705 x 10-4
Tm 1715 x 10-3
Tin (50)Sn 1139 x 10-4
Sn 1252 x 10-4
Tungsten (Wolfram) (74)W 1814 x 10-3
W 1877 x 10-4
Vanadium (23)V 483 x 10-4
Xenon (54)Xe 131m4 x 10-6
Xe 1333 x 10-6
Xe 1351 x 10-6
Ytterbium (70)Yb 1751 x 10-3
Yttrium (39)Y 902 x 10-4
Y 91m3 x 10-2
Y 913 x 10-4
Y 926 x 10-4
Y 933 x 10-4
Zinc (30)Zn 651 x 10-3
Zn 69m7 x 10-4
Zn 692 x 10-2
Zirconium (40)Zr 956 x 10-4
Zr 972 x 10-4
Beta- or gamma- emitting radioactive material not listed above with half-life less than three years1 x 10-101 x 10-6

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

2 µCi/gm for solids.

Minn. R. agency 144, ch. 4731, DOMESTIC LICENSING OF RADIOACTIVE MATERIALS, pt. 4731.3140

29 SR 755

Statutory Authority: MS s 144.1202; 144.1203