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

12VAC5-481-3780. Nationally Tracked Source Thresholds.

The terabecquerel (TBq) values are the regulatory standard. The curie (Ci) values specified are obtained by converting from the TBq value. The curie values are provided for practical usefulness only and are rounded after conversion.

Radioactive material

Category 1 (TBq)

Category 1 (Ci)

Category 2 (TBq)

Category 2 (Ci)

Actinium-227

20

540

0.2

5.4

Americium-241

60

1,600

0.6

16

Americium-241/Be

60

1,600

0.6

16

Californium-252

20

540

0.2

5.4

Cobalt-60

30

810

0.3

8.1

Curium-244

50

1,400

0.5

14

Cesium-137

100

2,700

1

27

Gadolinium-153

1,000

27,000

10

270

Iridium-192

80

2,200

0.8

22

Plutonium-238

60

1,600

0.6

16

Plutonium-239/Be

60

1,600

0.6

16

Polonium-210

60

1,600

0.6

16

Promethium-147

40,000

1,100,000

400

11,000

Radium-226

40

1,100

0.4

11

Selenium-75

200

5,400

2

54

Strontium-90

1,000

27,000

10

270

Thorium-228

20

540

0.2

5.4

Thorium-229

20

540

0.2

5.4

Thulium-170

20,000

540,000

200

5,400

Ytterbium-169

300

8,100

3

81

Statutory Authority

§ 32.1-229 of the Code of Virginia.

Historical Notes

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

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