12VAC54813720. Exempt concentrations schedule.
Element (atomic number)  Isotope  Col. I  Col. II 
Gas Concentration μCi/ml^{1}  Liquid and Solid Concentration μCi/ml^{2}  
Antimony (51)  Sb122 
 3 x 10^{4} 
Sb124  2 x 10^{4}  
Sb125  1 x 10^{3}  
Argon (18)  A37  1 x 10^{3} 

A41  4 x 10^{7}  
Arsenic (33)  As73 
 5 x 10^{3} 
As74  5 x 10^{4}  
As76  2 x 10^{4}  
As77  8 x 10^{4}  
Barium (56)  Ba131 
 2 x 10^{3} 
Ba140  3 x 10^{4}  
Beryllium (4)  Be7 
 2 x 10^{2} 
Bismuth (83)  Bi206 
 4 x 10^{4} 
Bromine (35)  Br82  4 x 10^{7}  3 x 10^{3} 
Cadmium (48)  Cd109 
 2 x 10^{3} 
Cd115M  3 x 10^{4}  
Cd115  3 x 10^{4}  
Calcium (20)  Ca45 
 9 x 10^{5} 
Ca47  5 x 10^{4}  
Carbon (6)  C14  1 x 10^{6}  8 x 10^{3} 
Cerium (58)  Ce141 
 9 x 10^{4} 
Ce143  4 x 10^{4}  
Ce144  1 x 10^{4}  
Cesium (55)  Cs131 
 2 x 10^{2} 
Cs134m  6 x 10^{2}  
Cs134  9 x 10^{5}  
Chlorine (17)  Cl38  9 x 10^{7}  4 x 10^{3} 
Chromium (24)  Cr51 
 2 x 10^{2} 
Cobalt (27)  Co57 
 5 x 10^{3} 
Co58  1 x 10^{3}  
Co60  5 x 10^{4}  
Copper (29)  Cu64 
 3 x 10^{3} 
Dysprosium (66)  Dy165 
 4 x 10^{3} 
Dy166  4 x 10^{4}  
Erbium (68)  Er169 
 9 x 10^{4} 
Er171  1 x 10^{3}  
Europium (63)  Eu152 (9.2 hrs) 
 6 x 10^{4} 
Eu155  2 x 10^{3}  
Fluorine (9)  F18  2 x 10^{6}  8 x 10^{3} 
Gadolinium (64)  Gd153 
 2 x 10^{3} 
Gd159  8 x `0^{4}  
Gallium (31)  Ga72 
 4 x 10^{4} 
Germanium (32)  Ge71 
 2 x 10^{2} 
Gold (79)  Au196 
 2 x 10^{3} 
Au198  5 x 10^{4}  
Au199  2 x 10^{3}  
Hafnium (72)  Hf81 
 7 x 10^{4} 
Hydrogen (1)  H3  5 x 10^{6}  3 x 10^{2} 
Indium (49)  In113M 
 1 x 10^{2} 
In114M  2 x 10^{4}  
Iodine (53)  I126  3 x 10^{9}  2 x 10^{5} 
I131  3 x 10^{9}  2 x 10^{5}  
I132  8 x 10^{8}  6 x 10^{4}  
I133  1 x 10^{8}  7 x 10^{5}  
I134  2 x 10^{7}  1 x 10^{3}  
Iridium (77)  Ir190 
 2 x 10^{3} 
Ir192  4 x 10^{4}  
Ir194  3 x 10^{4}  
Iron (26)  Fe55 
 8 x 10^{3} 
Fe59  6 x 10^{4}  
Krypton (36)  Kr85M  1 x 10^{6} 

Kr85  3 x 10^{6}  
Lanthanum (57)  La140 
 2 x 10^{4} 
Lead (82)  Pb203 
 4 x 10^{3} 
Lutetium (71)  Lu177 
 1 x 10^{3} 
Manganese (25)  Mn52 
 3 x 10^{4} 
Mn54  1 x 10^{3}  
Mn56  1 x 10^{3}  
Mercury (80)  Hg197M 
 2 x 10^{3} 
Hg197  3 x 10^{3}  
Hg203  2 x 10^{4}  
Molybdenum (42)  Mo99 
 2 x 10^{3} 
Neodymium (60)  Nd147 
 6 x 10^{4} 
Nd149  3 x 10^{3}  
Nickel (28)  Ni65 
 1 x 10^{3} 
Niobium (Columbium) (41)  Nb95 
 1 x 10^{3} 
Nb97  9 x 10^{3}  
Osmium (76)  Os185 
 7 x 10^{4} 
Os191M  3 x 10^{2}  
Os191  2 x 10^{3}  
Os193  6 x 10^{4}  
Palladium (46)  Pd103 
 3 x 10^{3} 
Pd109  9 x 10^{4}  
Phosphorus (15)  P32 
 2 x 10^{4} 
Platinum (78)  Pt191 
 1 x 10^{3} 
Pt193M  1 x 10^{2}  
Pt197M  1 x 10^{2}  
Pt197  1 x 10^{3}  
Potassium (19)  K42 
 3 x 10^{3} 
Praseodymium (59)  Pr142 
 3 x 10^{4} 
Pr143  5 x 10^{4}  
Promethium (61)  Pm147 
 2 x 10^{3} 
Pm149  4 x 10^{4}  
Rhenium (75)  Re183 
 6 x 10^{3} 
Re186  9 x 10^{4}  
Re188  6 x 10^{4}  
Rhodium (45)  Rh103M 
 1 x 10^{1} 
Rh105  1 x 10^{3}  
Rubidium (37)  Rb86 
 7 x 10^{4} 
Ruthenium (44)  Ru97 
 4 x 10^{4} 
Ru103  8 x 10^{4}  
Ru105  1 x 10^{3}  
Ru106  1 x 10^{4}  
Samarium (62)  Sm153 
 8 x 10^{4} 
Scandium (21)  Sc46 
 4 x 10^{4} 
Sc47  9 x 10^{4}  
Sc48  3 x 10^{4}  
Selenium (34)  Se75 
 3 x 10^{3} 
Silicon (14)  Si31 
 9 x 10^{3} 
Silver (47)  Ag105 
 1 x 10^{3} 
Ag110M  3 x 10^{4}  
Ag111  4 x 10^{4}  
Sodium (11)  Na24 
 2 x 10^{3} 
Strontium (38)  Sr85 
 1 x 10^{4} 
Sr89  1 x 10^{4}  
Sr91  7 x 10^{4}  
Sr92  7 x 10^{4}  
Sulfur (16)  S35  9 x 10^{8}  6 x 10^{4} 
Tantalum (73)  Ta182 
 4 x 10^{4} 
Technetium (43)  Tc96M 
 1 x 10^{1} 
Tc96  1 x 10^{3}  
Tellurium (52)  Te125M 
 2 x 10^{3} 
Te125M  6 x 10^{4}  
Te127  3 x 10^{3}  
Te129M  3 x 10^{4}  
Te131M  6 x 10^{4}  
Te132  3 x 10^{4}  
Terbium (65)  Tb160 
 4 x 10^{4} 
Thallium (81)  Tl200 
 4 x 10^{3} 
Tl201  3 x 10^{3}  
Tl202  1 x 10^{3}  
Tl204  1 x 10^{3}  
Thulium (69)  Tm170 
 5 x 10^{4} 
Tm171  5 x 10^{3}  
Tin (50)  Sn113 
 9 x 10^{4} 
Sn125  2 x 10^{4}  
Tungsten (Wolfram) (74)  W181 
 4 x 10^{3} 
W187  7 x 10^{4}  
Vanadium (23)  V48 
 3 x 10^{4} 
Xenon (54)  Xe131M  4 x 10^{6} 

Xe133  3 x 10^{6}  
Xe135  1 x 10^{6}  
Ytterbium (70)  Yb175 
 1 x 10^{3} 
Yttrium (39)  Y90 
 2 x 10^{4} 
Y91M  3 x 10^{2}  
Y91  3 x 10^{4}  
Y92  6 x 10^{4}  
Y93  3 x 10^{4}  
Zinc (30)  Zn65 
 1 x 10^{3} 
Zn69M  7 x 10^{4}  
Zn69  2 x 10^{2}  
Zirconium (40)  Zr95 
 6 x 10^{4} 
Zr97  2 x 10^{4}  
Beta and/or gamma emitting 
 1 x 10^{10}  1 x 10^{6} 
Footnotes: ^{1}Values are given only for those materials normally used as gases. ^{2}μCi/gm for solids. 
NOTE 1: Many radioisotopes disintegrate into isotopes that are also radioactive. In expressing the concentrations, the activity stated is that of the parent isotope and takes into account the daughters.
NOTE 2: For purposes of 12VAC5481400 A where there is involved a combination of isotopes, 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 for the specific isotope when not in combination. The sum of such ratios may not exceed "1" (i.e., unity).
Example:
Statutory Authority
§ 32.1229 of the Code of Virginia.
Historical Notes
Derived from Virginia Register Volume 24, Issue 18, eff. June 12, 2008.