Convert Curies to Gigabecquerels
Convert Curies (Ci) to Gigabecquerels (GBq) instantly and accurately.
Conversion Formula
GBq = Ci × 37
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 Gigabecquerels
The gigabecquerel (GBq) equals 10⁹ Bq. Therapeutic radiopharmaceuticals are dosed in GBq: ¹⁷⁷Lu-PSMA prostate cancer therapy uses 7.4 GBq per cycle; ¹³¹I thyroid cancer ablation uses 3.7-7.4 GBq; ²²³Ra-dichloride (Xofigo) bone metastasis therapy ~3-5 GBq per injection. 1 GBq = 10⁹ Bq.
Quick Reference Table
| Curies (Ci) | Gigabecquerels (GBq) |
|---|---|
| 1 Ci | 37 GBq |
| 2 Ci | 74 GBq |
| 5 Ci | 185 GBq |
| 10 Ci | 370 GBq |
| 25 Ci | 925 GBq |
| 50 Ci | 1850 GBq |
| 100 Ci | 3700 GBq |