Radioactivity
CitokBq
Convert curies (Ci) to kilobecquerels (kBq).
Factor1 Ci = 3.7e+7 kBq
Converter
Ci
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kBq
Rendered to 6 significant figures.
Formula
Formula
kBq = Ci × 3.7e+7
Multiply any value in curies by 3.7e+7 to obtain the value in kilobecquerels.
Worked example
Convert 1 Ci to kBq.
- 01Start with 1 Ci.
- 02Multiply by the conversion factor: 1 × 3.7e+7 = 3.7e+7 kBq.
Result1 Ci = 3.7e+7 kBq
Conversion table
| Ci | kBq |
|---|---|
| 1 | 3.7e+7 |
| 2 | 7.4e+7 |
| 5 | 1.85e+8 |
| 10 | 3.7e+8 |
| 20 | 7.4e+8 |
| 50 | 1.85e+9 |
| 100 | 3.7e+9 |
| 200 | 7.4e+9 |
| 500 | 1.85e+10 |
| 1000 | 3.7e+10 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Ci to kBq?
1 Ci equals 3.7e+7 kBq. To convert, multiply the value in curies by 3.7e+7.
How do I convert 1 Ci to kBq?
1 Ci = 3.7e+7 kBq. For any value, multiply by 3.7e+7.
How do I convert kBq back to Ci?
Divide by the same factor — or equivalently, multiply by 2.702703e-8. So 1 kBq = 2.7027e-8 Ci.
When would I need to convert curie to kilobecquerel?
Radioactivity (activity) conversions between Ci and kBq are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).