Convert Curies to Nanocuries
Convert Curies (Ci) to Nanocuries (nCi) instantly and accurately.
Conversion Formula
nCi = Ci × 1000000000
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 Nanocuries
The nanocurie (nCi) equals 37 Bq. Sealed radioactive sources in laboratory instruments (electron-capture detectors in GC, ionisation chambers) are licensed in nCi; nCi is the working unit on US NRC licence forms and instrument calibration certificates for low-level sources. 1 nCi = 37 Bq = 3.7 × 10⁻⁸ Ci.
Quick Reference Table
| Curies (Ci) | Nanocuries (nCi) |
|---|---|
| 1 Ci | 1000000000 nCi |
| 2 Ci | 2 × 109 nCi |
| 5 Ci | 5 × 109 nCi |
| 10 Ci | 1 × 1010 nCi |
| 25 Ci | 2.5 × 1010 nCi |
| 50 Ci | 5 × 1010 nCi |
| 100 Ci | 1 × 1011 nCi |