Convert Becquerels to Curies
Convert Becquerels (Bq) to Curies (Ci) instantly and accurately.
Conversion Formula
Ci = Bq × 2.702702703e-11
About Becquerels
The becquerel (Bq) is the SI coherent unit of radioactivity, defined as exactly one nuclear disintegration per second. Named after Henri Becquerel (discoverer of radioactivity, 1896), it replaced the curie in SI. Household smoke detector ²⁴¹Am sources contain ~30 kBq; a banana contains ~15 Bq of ⁴⁰K. 1 Bq = 1 s⁻¹.
About Curies
The curie (Ci) equals exactly 3.7 × 10¹⁰ Bq = 37 GBq, originally defined as the activity of 1 g of ²²⁶Ra. Still widely used in the US: ⁶⁰Co teletherapy sources are 5000-15000 Ci; ¹³⁷Cs blood irradiators are 1000-40000 Ci; NRC source licences for industrial radiography cite Ci limits. 1 Ci = 3.7 × 10¹⁰ Bq.
Quick Reference Table
| Becquerels (Bq) | Curies (Ci) |
|---|---|
| 1 Bq | 2.703 × 10-11 Ci |
| 2 Bq | 5.405 × 10-11 Ci |
| 5 Bq | 1.351 × 10-10 Ci |
| 10 Bq | 2.703 × 10-10 Ci |
| 25 Bq | 6.757 × 10-10 Ci |
| 50 Bq | 1.351 × 10-9 Ci |
| 100 Bq | 2.703 × 10-9 Ci |