Convert Curies to Millicuries
Convert Curies (Ci) to Millicuries (mCi) instantly and accurately.
Conversion Formula
mCi = Ci × 1000
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 Millicuries
The millicurie (mCi) equals 3.7 × 10⁷ Bq = 37 MBq. The primary clinical nuclear medicine unit in the US: ¹⁸F-FDG PET doses are 8-15 mCi; ⁹⁹mTc cardiac stress tests use 25-35 mCi; ¹³¹I hyperthyroidism therapy uses 5-30 mCi. US pharmacopeia and NRC regulations specify doses in mCi. 1 mCi = 3.7 × 10⁷ Bq.
Quick Reference Table
| Curies (Ci) | Millicuries (mCi) |
|---|---|
| 1 Ci | 1000 mCi |
| 2 Ci | 2000 mCi |
| 5 Ci | 5000 mCi |
| 10 Ci | 10000 mCi |
| 25 Ci | 25000 mCi |
| 50 Ci | 50000 mCi |
| 100 Ci | 100000 mCi |