1. a) One becquerel (Bq) = 1 disintegration (transformation) per second (dps or tps).
2. b) One curie (Ci) = 3.7 x 10¹⁰ disintegrations (transformations) per second (dps or tps) = 3.7 x 10¹⁰ becquerel (Bq) = 2.22 x 10¹² disintegrations (transformations) per minute (dpm or tpm).

For the purposes of 32 Ill. Adm. Code: Chapter II, Subchapters b and d, activity is expressed in the SI unit of becquerel (Bq) or in the special unit of curie (Ci), or their multiples, or disintegrations (transformations) per unit of time (dps, dpm, tps or tpm).

(Source: Added at 17 Ill. Reg. 18472, effective January 1, 1994)