10 CFR Appendix E to Part 20, Nationally Tracked Source Thresholds

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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-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
[ 71 FR 65708, Nov. 8, 2006]

Title 10 published on 06-Jun-2018 04:00

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 10 CFR Part 20 after this date.

  • 2018-02-07; vol. 83 # 26 - Wednesday, February 7, 2018
    1. 83 FR 5373 - Regulatory Improvements for Power Reactors Transitioning to Decommissioning
      GPO FDSys XML | Text
      NUCLEAR REGULATORY COMMISSION
      Regulatory analysis; availability.
      The regulatory analysis is available February 7, 2018.
      10 CFR Parts 20, 26, 50, 51, 52, 72, 73, and 140