Free Radioactive Activity Calculator
Calculate radioactive activity (decays per second) using A = lambda * N = (ln2 / t_half) * N.
s
Activity
19,254,088,348,887,370 Bq
Decay Constant0.00019254 1/s
Activity (Ci)520,380.766186 Ci
Activity vs Number of Atoms
Radioactive Activity
Activity measures the rate of radioactive decays per unit time.
Formula
A = lambda * N = (ln2 / t_half) * N
where lambda is the decay constant, N is the number of atoms, and t_half is the half-life. The unit is becquerel (Bq) = 1 decay/second.
Example Calculation
1 x 10^20 atoms with a half-life of 3600 s (1 hour).
- 01lambda = ln(2) / t_half = 0.6931 / 3600 = 1.925e-4 /s
- 02A = lambda * N = 1.925e-4 * 1e20
- 03A = 1.925e16 Bq
- 04A = 1.925e16 / 3.7e10 = 520,270 Ci
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