Half-life and decay constant (t½ = ln(2)/λ)
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t½ = ln(2)/λ
What each symbol means
| Symbol | What it stands for |
|---|---|
| λ | Decay constant (s⁻¹) |
| ln 2 | ≈ 0.693 |
| t_{1/2} | Time for N to drop to half (s) |
When to use this
Single radioactive species; λ constant.