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Solve exponential decay from any three measurements, or convert between half-life, mean lifetime and decay constant.
Exponential decay is N(t) = N₀ · 2^(−t/T). T is half-life, mean lifetime is T/ln(2), and the decay constant is ln(2)/T. The conversion uses ln(2) rounded to ten decimal places. Use the same time unit for all fields.
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