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N. C. Regulations for Protection Against Radiation

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15A NCAC 11 .0303          EXEMPT CONCENTRATIONS: OTHER THAN SOURCE MATERIAL

(a)  No person shall introduce radioactive material into a product or material knowing or having reason to believe that it will be transferred to persons exempt under Paragraph (b) of this Rule or equivalent regulations of the U.S. Nuclear Regulatory Commission or any agreement state, except in accordance with a specific license issued pursuant to Rule .0325 of this Section.

(b)  Except as provided in Paragraph (a) of this Rule, any person is exempt from these Rules to the extent that such person receives, possesses, uses, transfers, owns, or acquires products or materials containing radioactive material in concentrations not in excess of those listed in the following table:

 

 

EXEMPT CONCENTRATIONS
Element
(atomic number)
  Isotope
  Column I
Gas concentration
microcurie/ml
  Column II
Liquid and Solid
Concentration
microcurie/ml
Antimony (51)   Sb 122       3X10‑4
    Sb 124       2X10‑4
    Sb 125       1X10‑3
             
Argon (18)   Ar 37   1X10‑3    
    Ar 41   4X10‑7    
             
Arsenic (33)   As 73       5X10‑3
    As 74       5X10‑4
    As 76       2X10‑4
    As 77       8X10‑4
             
Barium (56)   Ba 131       2X10‑3
    Ba 140       3X10‑4
             
Beryllium (4)   Be 7       2X10‑2
             
Bismuth (83)   Bi 206       4X10‑4
             
Bromine (35)   Br 82   4X10‑7   3X10‑3
             
Cadmium (48)   Cd 109       2X10‑3
    Cd 115m       3X10‑4
    Cd 115       3X10‑4
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Calcium (20)   Ca 45       9X10‑5
    Ca 47       5X10‑4
             
Carbon (6)   C 14   1X10‑6    8X10‑3
             
Cerium (58)   Ce 141       9X10‑4
    Ce 143       4X10‑4
    Ce 144       4X10‑4
             
Cesium (55)   Cs 131       2X10‑2
    Cs 134m       6X10‑2
    Cs 134       9X10‑5
             
Chlorine (17)   Cl 38   9X10‑7   4X10-3
             
Chromium (24)   Cr 51       2X10‑2
             
Cobalt (27)   Co 57       5X10‑3
    Co 58       1X10‑3
    Co 60       5X10‑4
             
Copper (29)   Cu 64       3X10‑3
             
Dysprosium (66)   Dy 165       4X10‑3
    Dy 166       4X10‑4
             
Erbium (68)   Er 169       9X10‑4
    Er 171        1X10‑3
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Europium (63)   Eu 152
(T1/2 =9.2 Hrs.)
      6X10‑4
    Eu 155       2X10‑3
             
Fluorine (9)   F 18   2X10‑6   8X10‑3
             
Gadolinium (64)   Gd 153       2X10‑3
    Gd 159       8X10‑4
             
Gallium (31)   Ga 72       4X10‑4
             
Germanium (32)    Ge 71       2X10‑2
             
Gold (79)   Au 196       2X10‑3
    Au 198       5X10‑4
    Au 199       2X10‑3
             
Hafnium (72)   Hf 181       7X10‑4
             
Hydrogen (1)   H 3   5X10‑6   3X10‑2
             
Indium (49)   In 113m       1X10‑2
    In 114m       2X10‑4
             
Iodine (53)   I 126   3X10‑9   2X10‑5
    I 131   3X10‑9   2X10‑5
    I 132   8X10‑8    6X10‑4
    I 133   1X10‑8   7X10‑5
    I 134   2X10‑7   1X10‑3
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Iridium (77)   Ir 190       2X10‑3
    Ir 192       4X10‑4
    Ir 194       3X10‑4
             
Iron (26)   Fe 55       8X10‑3
    Fe 59       6X10‑4
             
Krypton (36)    Kr 85m       1X10-6
    Kr 85       3X10-6
             
Lanthanum (57)   La 140       2X10‑4
             
Lead (82)   Pb 203       4X10‑3
             
Lutetium (71)   Lu 177       1X10‑3
             
Manganese (25)   Mn 52       3X10‑4
    Mn 54       1X10‑3
    Mn 56       1X10‑3
             
Mercury (80)   Hg 197m       2X10‑3
    Hg 197       3X10‑3
    Hg 203       2X10‑4
             
Molybdenum (42)   Mo 99       2X10‑3
             
Neodymium (60)   Nd 147       6X10‑3
    Nd 149       3X10‑4
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Nickel (28)   Ni 65       1X10‑3
             
Niobium(Columbium)(41)   Nb 95       1X10‑3
    Nb 97       9X10‑3
             
Osmium (76)   Os 185       7X10‑4
    Os 191m       3X10‑2
    Os 191       2X10‑3
    Os 193       6X10‑4
             
Palladium (46)   Pd 103       3X10‑3
    Pd 109       9X10‑4
             
Phosphorus (15)   P 32       2X10‑4
             
Platinum (78)   Pt 191       1X10‑3
    Pt 193m       1X10‑2
    Pt 197m       1X10‑2
    Pt 197       1X10‑3
             
Polonium (84)   Po 210       7X10‑6
             
Potassium (19)   K 42       3X10‑3
             
Praseodymium (59)   Pr 142       3X10‑4
    Pr 143       5X10‑4
             
Promethium (61)   Pm 147       2X10‑3
    Pm 149       4X10‑4
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Radium (88)   Ra 226       1X10‑7
    Ra 228       3X10‑7
             
Rhenium (75)   Re 183       6X10‑3
    Re 186       9X10‑4
    Re 188       6X10‑4
             
Rhodium (45)   Rh 103m       1X10‑1
    Rh 105       1X10‑3
             
Rubidium (37)   Rb 86       7X10‑4
             
Ruthenium (44)   Ru 97       4X10‑3
    Ru 103       8X10‑4
    Ru 105       1X10‑3
    Ru 106       1X10‑4
             
Samarium (62)   Sm 153       8X10‑4
             
Scandium (21)   Sc 46       4X10‑4
    Sc 47       9X10‑4
    Sc 48        3X10‑4
             
Selenium (34)   Se 75       3X10‑3
             
Silicon (14)   Si 31       9X10‑3
             
Silver (47)   Ag 105       1X10‑3
    Ag 110m       3X10‑4
    Ag 111       4X10‑4
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Sodium (11)   Na 24       2X10‑3
             
Strontium (38)   Sr 85       1X10‑3
    Sr 89       1X10‑4
    Sr 91       7X10‑4
    Sr 92       7X10‑4
             
Sulfur (16)   S 35   9X10‑8   6X10‑4
             
Tantalum (73)   Ta 182       4X10‑4
             
Technetium (43)   Tc 96m       1X10‑1
    Tc 96       1X10‑3
             
Tellurium (52)   Te 125m       2X10‑3
    Te 127m       6X10‑4
    Te 127       3X10‑3
    Te 129m       3X10‑4
    Te 131m       6X10‑4
    Te 132       3X10‑4
             
Terbium (65)   Tb 160       4X10‑4
             
Thallium (81)   Tl 200       4X10‑3
    Tl 201       3X10‑3
    Tl 202       1X10‑3
    Tl 204       1X10‑3
             
Thulium (69)   Tm 170       5X10‑4
    Tm 171       5X10‑3
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Tin (50)   Sn 113       9X10‑4
    Sn 125       2X10‑4
             
Tungsten(Wolfram) (74)   W 181       4X10‑3
    W 187       7X10‑4
             
Vanadium (23)   V 48       3X10‑4
             
Xenon (54)   Xe 131m       4X10‑6
    Xe 133       3X10‑6
    Xe 135       1X10‑6
             
Ytterbium (70)   Yb 175        1X10‑3
             
Yttrium (39)   Y 90       2X10‑4
    Y 91m       3X10‑2
    Y 91       3X10‑4
    Y 92       6X10‑4
    Y 93        3X10‑4
             
Zinc (30)   Zn 65       1X10‑3
    Zn 69m       7X10‑4
    Zn 69       2X10‑2
             
Zirconium (40)   Zr 95        6X10‑4
    Zr 97        2X10‑4
             
Beta and/or gamma emitting  radioactive material not listed above with half-life less than 3 years       1X10‑10   1X10‑6

 

 

(c)  In Column I of the table, in Paragraph (b) of this Rule, values are given only for those materials normally used as gases.

(d)  In Column II of the table, in Paragraph (b) of this Rule, the units, microcuries per gram, are used for solids.

(e)  Many radioisotopes disintegrate into isotopes which are also radioactive.  In expressing the concentrations in Paragraph (b) of this Rule, the activity stated is that of the parent isotope and takes into account the daughters.

(f)  For purposes of this Rule, where a combination of isotopes is involved, the limit for the combination shall 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 Paragraph (b) of this Rule for the specific isotope when not in combination.  The sum of the ratios shall not exceed unity.  An example of this is:

 

Concentration of Isotope A in Product + Concentration of Isotope B in Product less than or equal to 1
Exempt concentration of Isotope A Exempt concentration of Isotope B

 

History Note:        Authority G.S. 104E‑7; 104E‑10; 104E‑20;

Eff. February 1, 1980;

Amended Eff. May 1, 1993; June 1, 1989.

 

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