Convert Curies to Picocuries
Convert Curies (Ci) to Picocuries (pCi) instantly and accurately.
Conversion Formula
pCi = Ci × 1000000000000
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.
About Picocuries
The picocurie (pCi) equals 3.7 × 10⁻² Bq = 37 mBq. The US EPA uses pCi/L as the standard unit for indoor radon (action level: 4 pCi/L) and drinking water radon; NRC licence exemption thresholds and natural uranium activity in groundwater are expressed in pCi/L. 1 pCi = 3.7 × 10⁻² Bq.
Quick Reference Table
| Curies (Ci) | Picocuries (pCi) |
|---|---|
| 1 Ci | 1 × 1012 pCi |
| 2 Ci | 2 × 1012 pCi |
| 5 Ci | 5 × 1012 pCi |
| 10 Ci | 1 × 1013 pCi |
| 25 Ci | 2.5 × 1013 pCi |
| 50 Ci | 5 × 1013 pCi |
| 100 Ci | 1 × 1014 pCi |