Document: 10 CFR Part 20
Document ID: e51112ee-ad4d-4996-85b1-20ff7d7aded8
Document Type: cfr
Title: Units of radioactivity.
Source: 10 CFR Part 20
Source URL: https://www.ecfr.gov/current/title-10/part-20/section-20.1005
Revision Date: 
Chapter: 
Section ID: 20.1005
CFR Part: 20
CFR Title: 10

Content:
§ 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]