Radioactive decay activity measured as nuclear transitions per unit time.
All factors come from the central conversion registry.
| Unit | Symbol | System | Definition |
|---|---|---|---|
| Becquerel | Bq | SI | 1 Bq = 1 s⁻¹ |
| Kilobecquerel | kBq | SI | 1 kBq = 1,000 Bq |
| Millibecquerel | mBq | SI | 1 mBq = 0.001 Bq |
| Megabecquerel | MBq | SI | 1 MBq = 1,000,000 Bq |
| Gigabecquerel | GBq | SI | 1 GBq = 1,000,000,000 Bq |
| Curie | Ci | Non-SI | 1 Ci = 3.7 × 10¹⁰ Bq |
| Millicurie | mCi | Non-SI | 1 mCi = 3.7 × 10⁷ Bq |
| Microcurie | µCi | Non-SI | 1 µCi = 3.7 × 10⁴ Bq |
| Nanocurie | nCi | Non-SI | 1 nCi = 37 Bq |
| Picocurie | pCi | Non-SI | 1 pCi = 0.037 Bq |
| Disintegrations per minute | dpm | Rate | 1 dpm = 1/60 Bq |
Radioactive activity measures nuclear transitions per unit time. One becquerel is one transition per second. Curie-based units describe the same physical quantity and convert directly to Bq; activity is not the same quantity as absorbed dose or dose equivalent.
The interactive calculator, reference table and indexed pair pages all read from the same conversion registry, so unit definitions and formulas stay synchronized.
Becquerels, curies and disintegrations per minute describe radioactive activity. A Bq value alone cannot be turned into sieverts with one universal multiplier.