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

TABLE 467.1 Radioactive Material Category 1 terabecquerel Category 1 curie Category 2 terabecquerel Category 2 curie 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

TABLE 467.1

Radioactive Material

Category 1

terabecquerel

Category 1

curie

Category 2

terabecquerel

Category 2

curie

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

HISTORY OF 20.3.4 NMAC:

Pre-NMAC History: The material in this part was derived from that previously filed as follows:

EIB 73-2, Regulations for Governing the Health and Environmental Aspects of Radiation filed on 7/9/1973;

EIB 73-2, Amendment 1, Regulations for Governing the Health and Environmental Aspects of Radiation filed on 4/17/1978;

EIB RPR-1, Radiation Protection Regulations filed on 4/21/1980;

EIB RPR-1, Amendment 1, Radiation Protection Regulations filed on 10/13/1981;

EIB RPR-1, Amendment 2, Radiation Protection Regulations filed on 12/15/1982; and

EIB RPR-1, Radiation Protection Regulations filed on 3/10/1989.

History of Repealed Material: 20.3.4 NMAC, Standards for Protection Against Radiation (filed 3/15/2004) repealed 4/30/2009.

Other History: EIB RPR 1, Radiation Protection Regulations, filed 3/10/1989 renumbered and reformatted to 20 NMAC 3.1; Radioactive Materials and Radiation Machines, effective 5/3/1995;

20 NMAC 3.1; Radioactive Materials and Radiation Machines (filed 4/3/1995) internally renumbered, reformatted and replaced by 20 NMAC 3.1, Radioactive Materials and Radiation Machines, effective 7/30/1999.

20 NMAC 3.1.Subpart 4, Standards for Protection Against Radiation (filed 6/17/1999) reformatted, amended and replaced by 20.3.4 NMAC, Standards for Protection Against Radiation, effective 4/15/2004.

20.3.4 NMAC, Standards for Protection Against Radiation (filed 03/15/2004) replaced by 20.3.4 NMAC, Standards for Protection Against Radiation, effective 4/30/2009.

[20.3.4.467 NMAC - N, 4/30/2009]