Becquerel (Bq) 12 : The SI unit of activity, equal to one transformation per second. Supersedes the non-SI unit curie (Ci). 1 Bq = 27 pCi (2.7 * 10-11 Ci) approximately. 1 Ci = 3.7 * 1010 Bq
International Atomic Energy Agency IAEA, Department of Nuclear Safety and Security, IAEA Safety Glossary (Terminology Used In Nuclear Safety and Radiation Protection), IAEA, Vienna. Austria 2007. ISBN 92-0-100707-8, http://www-pub.iaea.org/MTCD/publications/PDF/Pub1 290_web.pdf, (Nucl Sfty and Rad Prot - Brit) {459}