Convert Picocuries to Curies
Convert Picocuries (pCi) to Curies (Ci) instantly and accurately.
Conversion Formula
Ci = pCi × 1.000000000e-12
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.
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
| Picocuries (pCi) | Curies (Ci) |
|---|---|
| 1 pCi | 1 × 10-12 Ci |
| 2 pCi | 2 × 10-12 Ci |
| 5 pCi | 5 × 10-12 Ci |
| 10 pCi | 1 × 10-11 Ci |
| 25 pCi | 2.5 × 10-11 Ci |
| 50 pCi | 5 × 10-11 Ci |
| 100 pCi | 1 × 10-10 Ci |