10 C.F.R. § 20 app E to Part 20

Current through October 31, 2024
Appendix E to Part 20 - 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-227205400.25.4
Americium-241601,6000.616
Americium-241/Be601,6000.616
Californium-252205400.25.4
Cobalt-60308100.38.1
Curium-244501,4000.514
Cesium-1371002,700127
Gadolinium-1531,00027,00010270
Iridium-192802,2000.822
Plutonium-238601,6000.616
Plutonium-239/Be601,6000.616
Polonium-210601,6000.616
Promethium-14740,0001,100,00040011,000
Radium-226401,1000.411
Selenium-752005,400254
Strontium-901,00027,00010270
Thorium-228205400.25.4
Thorium-229205400.25.4
Thulium-17020,000540,0002005,400
Ytterbium-1693008,100381

10 C.F.R. 20 app E to Part 20

71 FR 65708 , Nov. 8, 2006