// multi-utility computation suite · offline · instant · precise
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sci.radioactive-activity Calculator
Calculates radioactive activity A = λN = N × ln2/t½ and specific activity from nuclide mass. ¹⁴C has t½ = 5,730 years and specific activity = 0.165 Bq/µg — 1 gram of ²²⁶Ra has specific activity = 3.7 × 10¹⁰ Bq (1 Curie), the original definition of the curie unit.
Inputs
N Atoms
Count of items or occurrences.
T Half S
Reference formula or conversion factor shown for context.
Time S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
initial activity A₀ (Bq)
Rate of radioactive decay events per second (becquerels or curies). Decreases exponentially with time.
activity at time t (Bq)
Rate of radioactive decay events per second (becquerels or curies). Decreases exponentially with time.