Convert Curies to Megabecquerels
Convert Curies (Ci) to Megabecquerels (MBq) instantly and accurately.
Conversion Formula
MBq = Ci × 37000
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 Megabecquerels
The megabecquerel (MBq) equals 10⁶ Bq and is the standard clinical nuclear medicine unit outside the US. ⁹⁹mTc bone scans use 740 MBq; ¹⁸F-FDG PET scans use 370 MBq; ¹³¹I diagnostic thyroid scans use 185-370 MBq. European and Australian protocols specify all doses in MBq. 1 MBq = 10⁶ Bq.
Quick Reference Table
| Curies (Ci) | Megabecquerels (MBq) |
|---|---|
| 1 Ci | 37000 MBq |
| 2 Ci | 74000 MBq |
| 5 Ci | 185000 MBq |
| 10 Ci | 370000 MBq |
| 25 Ci | 925000 MBq |
| 50 Ci | 1850000 MBq |
| 100 Ci | 3700000 MBq |