10 CFR 20.1005 - Units of radioactivity.

§ 20.1005 Units of radioactivity.

For the purposes of this part, activity is expressed in the special unit of curies (Ci) or in the SI unit of becquerels (Bq), or their multiples, or disintegrations (transformations) per unit of time.

(a) One becquerel = 1 disintegration per second (s−1).

(b) One curie = 3.7 × 10 10 disintegrations per second = 3.7 × 10 10 becquerels = 2.22 × 10 12 disintegrations per minute.

[ 56 FR 23391, May 21, 1991; 56 FR 61352, Dec. 3, 1991]

Title 10 published on 10-May-2017 03:48

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

  • 2016-12-28; vol. 81 # 249 - Wednesday, December 28, 2016
    1. 81 FR 95410 - Rulemaking Activities Being Discontinued by the NRC
      GPO FDSys XML | Text
      NUCLEAR REGULATORY COMMISSION
      Rulemaking activities; discontinuation.
      Effective December 28, 2016, the rulemaking activities discussed in this document are discontinued.
      10 CFR Parts 20 and 50
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