Convert Curies to Megacuries
Convert Curies (Ci) to Megacuries (MCi) instantly and accurately.
Conversion Formula
MCi = Ci × 1.000000000e-6
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 Megacuries
The megacurie (MCi) equals 3.7 × 10¹⁶ Bq. Total radioactive inventory of a large nuclear power reactor core at shutdown is ~2000-10000 MCi; US atmospheric nuclear weapons tests released ~12000 MCi of ¹³¹I globally; high-level nuclear waste repositories are characterised in MCi. 1 MCi = 3.7 × 10¹⁶ Bq.
Quick Reference Table
| Curies (Ci) | Megacuries (MCi) |
|---|---|
| 1 Ci | 1 × 10-6 MCi |
| 2 Ci | 2 × 10-6 MCi |
| 5 Ci | 5 × 10-6 MCi |
| 10 Ci | 1 × 10-5 MCi |
| 25 Ci | 2.5 × 10-5 MCi |
| 50 Ci | 5 × 10-5 MCi |
| 100 Ci | 1 × 10-4 MCi |