Title 10

PART 37 APPENDIX A



Appendix A to Part 37 - Category 1 and Category 2 Radioactive Materials

10:1.0.1.1.27.7.94.4.21 : Appendix A

Appendix A to Part 37 - Category 1 and Category 2 Radioactive Materials Table 1 - Category 1 and Category 2 Threshold

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.

Radioactive material Category 1
(TBq)
Category 1
(Ci)
Category 2
(TBq)
Category 2
(Ci)
Americium-241 60 1,620 0.6 16.2
Americium-241/Be 60 1,620 0.6 16.2
Californium-252 20 540 0.2 5.40
Cobalt-60 30 810 0.3 8.10
Curium-244 50 1,350 0.5 13.5
Cesium-137 100 2,700 1 27.0
Gadolinium-153 1,000 27,000 10 270
Iridium-192 80 2,160 0.8 21.6
Plutonium-238 60 1,620 0.6 16.2
Plutonium-239/Be 60 1,620 0.6 16.2
Promethium-147 40,000 1,080,000 400 10,800
Radium-226 40 1,080 0.4 10.8
Selenium-75 200 5,400 2 54.0
Strontium-90 1,000 27,000 10 270
Thulium-170 20,000 540,000 200 5,400
Ytterbium-169 300 8,100 3 81.0