Radiological Units Conversions
Supported units
Converts radioactivity and time units. Activity: becquerel (Bq, kBq, MBq, GBq, TBq) and curie (Ci, mCi, µCi, nCi, pCi), plus count rates cpm and dpm. System relation: 1 Ci = 3.7·10¹⁰ Bq.
Converting cpm to activity requires the detector counting efficiency — registered counts are not the same as disintegrations. The calculator requires an explicit efficiency value, otherwise the result is incorrect.
The time unit converter (from picoseconds to years) uses the same engine as the decay calculator: one year equals 365.25 days.
1 Ci = 3.7·10¹⁰ Bq exactly, by definition. Hence 1 mCi = 37 MBq, 1 µCi = 37 kBq and 1 Bq = 27.027 pCi.
A becquerel is one decay per second, dpm is decays per minute: 1 Bq = 60 dpm. Counts per minute (cpm) are instrument readings; converting them to activity requires the counting efficiency.
Bq, kBq, MBq, GBq, TBq, Ci, mCi, µCi, nCi, pCi, dpm and cpm with a counting efficiency. The result is shown in all units at once, and popular pairs have dedicated pages with the formula.