Code of Maine Rules
10 - DEPARTMENT OF HEALTH AND HUMAN SERVICES
144 - DEPARTMENT OF HEALTH AND HUMAN SERVICES - GENERAL
Chapter 220 - Rules Relating to Radiation Protection
Part D - STANDARDS FOR PROTECTION AGAINST RADIATION
Appendix 144-220-D-E - NATIONALLY TRACKED SOURCE THRESHOLDS

Universal Citation: 10 ME Code Rules ยง 144-220-D-E
Current through 2024-38, September 18, 2024

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

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.

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