Activity (decay rate) (R = λN (activity = decay constant × surviving nuclei))
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R = λN (activity = decay constant × surviving nuclei)
What each symbol means
| Symbol | What it stands for |
|---|---|
| N | Undecayed nuclei present |
| R | Activity (decays per second, Bq) |
| λ | Decay constant (s⁻¹) |
When to use this
Valid when daughter activity negligible or question isolates parent; units SI Bq = 1 decay/s.