UnitConRadiation Activity
Radioactivity, or activity, measures how quickly a radioactive source decays. The SI unit is the becquerel, while the curie is an older unit still seen in nuclear medicine and legacy references. This converter is for reference and educational purposes only. It is not a substitute for professional radiation safety guidance.
Common conversions
| From | To |
|---|---|
| 1 Curie | 37,000,000,000 Becquerel |
| 1 Millicurie | 37 Megabecquerel |
| 370 Megabecquerel | 10 Millicurie |
| 1 Megabecquerel | 0.02702703 Millicurie |
| 1 Kilobecquerel | 1,000 Becquerel |
| 10 Microcurie | 370,000 Becquerel |
Frequently asked questions
A becquerel is one radioactive decay per second. It is the SI unit of radioactive activity.
The curie is an older activity unit still seen in medicine and historical literature. One curie equals 3.7 × 10¹⁰ becquerels.
Activity tells you how rapidly a source decays, while dose describes exposure or absorbed biological effect. They are related only through the exposure situation, not by a fixed conversion.
PET procedures commonly use activity levels in the hundreds of megabecquerels. The exact amount depends on the tracer and protocol.