Calculateur d'Activité Radioactive Gratuit
Calculez l'activité d'un échantillon radioactif en becquerels. Déterminez le nombre de désintégrations par seconde.
Activité
19,254,088,348,887,370 Bq
Activity vs Number of Atoms
Formule
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.
Exemple Résolu
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
Questions Fréquentes
What is a becquerel?
One becquerel (Bq) equals one radioactive decay per second. It is the SI unit of activity, named after Henri Becquerel.
What is a curie?
An older unit of activity: 1 Ci = 3.7 x 10^10 Bq. Originally defined as the activity of 1 gram of radium-226.
Does activity change over time?
Yes. As atoms decay, N decreases, so activity decreases exponentially: A(t) = A_0 * (1/2)^(t/t_half).
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