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λ=ln2t1/2=0,693t1/2\displaystyle \lambda=\frac{\ln2}{t_{1/2}}=\frac{0{,}693}{t_{1/2}}λ=t1/2ln2=t1/20,693. Brukes i N=N0e−λtN=N_0 e^{-\lambda t}N=N0e−λt.
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