radioactivity / activity of a radionuclide · International · Modern
1 Bq = 1 s⁻¹
Converter
radioactivity / activity of a radionuclide · International / US legacy · Modern/historical
curie
exact
- Record
- M338
- Definition quality
- Exact by definition
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 Ci = 3.7×10¹⁰ Bq
Reference value
One curie is exactly 37,000,000,000 becquerels.
History & use
The curie predates the SI radiation unit becquerel; BIPM and NIST document its conversion while modern SI practice favors the becquerel.
Modern use
Modern use is context-dependent and varies by region or measurement system.