Administrative Code

Creating a Report: Check the sections you'd like to appear in the report, then use the "Create Report" button at the bottom of the page to generate your report. Once the report is generated you'll then have the option to download it as a pdf, print or email the report.

Virginia Administrative Code
Title 12. Health
Agency 5. Department of Health
Chapter 481. Virginia Radiation Protection Regulations
7/6/2020

12VAC5-481-3720. Exempt Concentrations Schedule.

Element (atomic number)

Isotope

Col. I

Col. II

Gas Concentration 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 x 10-7

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

(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 `0-4

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-81

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 10-4

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 and/or gamma emitting
radioactive material not
listed above with half-life
less than three years

1 x 10-10

1 x 10-6

Footnotes:

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

2μCi/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 12VAC5-481-400 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:

Equation showing the relationship described in Note 2 for two example isotopes

Statutory Authority

§ 32.1-229 of the Code of Virginia.

Historical Notes

Derived from Volume 24, Issue 18, eff. June 12, 2008.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

As a service to the public, the Virginia Administrative Code is provided online by the Virginia General Assembly. We are unable to answer legal questions or respond to requests for legal advice, including application of law to specific fact. To understand and protect your legal rights, you should consult an attorney.