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 19-May-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
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