Skip to main content
 

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

There are 2 Updates appearing in the Federal Register for 10 CFR 20. Select the tab below to view, or View eCFR (GPOAccess)
Pt. 20, App. E
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 2012-01-01

The following are only the Rules published in the Federal Register after the published date of Title 10.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2013-03-19; vol. 78 # 53 - Tuesday, March 19, 2013
    1. 78 FR 16922 - Physical Protection of Byproduct Material
      GPO FDSys XML | Text
      NUCLEAR REGULATORY COMMISSION
      Final rule.
      Effective Date: This final rule is effective on May 20, 2013. Compliance Date: Compliance with this final rule is required on March 19, 2014.
      10 CFR Parts 20, 30, 32, 33, 34, 35, 36, 37, 39, 51, 71, and 73

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


Title 10 published on 2012-01-01

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

  • 2013-03-19; vol. 78 # 53 - Tuesday, March 19, 2013
    1. 78 FR 16922 - Physical Protection of Byproduct Material
      GPO FDSys XML | Text
      NUCLEAR REGULATORY COMMISSION
      Final rule.
      Effective Date: This final rule is effective on May 20, 2013. Compliance Date: Compliance with this final rule is required on March 19, 2014.
      10 CFR Parts 20, 30, 32, 33, 34, 35, 36, 37, 39, 51, 71, and 73