Curie (Ci)
Older unit of radioactivity, originally about one gram of radium-226: exactly 3.7 × 10¹⁰ Bq.
What is a curie?
- Symbol
- Ci
- Quantity
- Radioactivity
- Unit system
- other
- Definition
- Older unit of radioactivity, originally about one gram of radium-226: exactly 3.7 × 10¹⁰ Bq.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Still used in the United States for sealed sources, industrial radiography and radioactive material licensing.
Curie in other radioactivity units
- 1 Ci = 37000000000 BqCurie to Becquerel converter
- 1 Ci = 37000000 kBqKilobecquerel
- 1 Ci = 37000 MBqMegabecquerel
- 1 Ci = 37 GBqGigabecquerel
- 1 Ci = 0.037 TBqTerabecquerel
- 1 Ci = 1000 mCiMillicurie
- 1 Ci = 1000000 µCiMicrocurie
- 1 Ci = 1000000000000 pCiPicocurie
- 1 Ci = 37000 RdRutherford
- 1 Ci = 2220000000000 dpmDisintegration per minute
Curie quick reference
| Curie | Becquerel | Gigabecquerel | Kilobecquerel |
|---|---|---|---|
| 1 Ci | = 37000000000 Bq | = 37 GBq | = 37000000 kBq |
| 10 Ci | = 370000000000 Bq | = 370 GBq | = 370000000 kBq |
| 100 Ci | = 3700000000000 Bq | = 3700 GBq | = 3700000000 kBq |
| 1000 Ci | = 37000000000000 Bq | = 37000 GBq | = 37000000000 kBq |
Where the curie fits
The next smaller radioactivity unit is the gigabecquerel (GBq). 1 Ci = 37 GBq, and 1 GBq ≈ 0.02702702703 Ci.
The next larger radioactivity unit is the terabecquerel (TBq). 1 Ci = 0.037 TBq, and 1 TBq ≈ 27.02702703 Ci.
Frequently asked questions
- How many becquerels are in one curie?
- One curie = 37000000000 Bq (becquerels).
- How many gigabecquerels are in one curie?
- One curie = 37 GBq (gigabecquerels).
- How many kilobecquerels are in one curie?
- One curie = 37000000 kBq (kilobecquerels).