United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > NRC Regulations (10 CFR) >  Part Index > § 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=3.7x1010 disintegrations per second=3.7x1010 becquerels=2.22x1012 disintegrations per minute.

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

Page Last Reviewed/Updated Friday, August 24, 2018