N. C. Regulations for Protection Against Radiation

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:

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

Eff. February 1, 1980;

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

NC Radiation Protection, 1645 Mail Service Center,
Raleigh, NC  27699-1645  919-571-4141  Fax  919-571-4148