Convert Curies to Kilocuries
Convert Curies (Ci) to Kilocuries (kCi) instantly and accurately.
Conversion Formula
kCi = Ci × 0.001
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 Kilocuries
The kilocurie (kCi) equals 3.7 × 10¹³ Bq. ⁶⁰Co and ¹³⁷Cs blood irradiation and food sterilisation facilities use 20-200 kCi sources; research reactor fission product inventories are characterised in kCi; ⁹⁰Sr/⁹⁰Y radioisotope thermoelectric generators (RTGs) contain 10-150 kCi. 1 kCi = 3.7 × 10¹³ Bq.
Quick Reference Table
| Curies (Ci) | Kilocuries (kCi) |
|---|---|
| 1 Ci | 0.001 kCi |
| 2 Ci | 0.002 kCi |
| 5 Ci | 0.005 kCi |
| 10 Ci | 0.01 kCi |
| 25 Ci | 0.025 kCi |
| 50 Ci | 0.05 kCi |
| 100 Ci | 0.1 kCi |