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Random process, can't predict individual nucleus decay
Probability of nucleus decaying per unit time
N=N0e−λtN = N_0 e^{-\lambda t}N=N0e−λt
Time for half of nuclei in sample to decay
T1/2=ln2λT_{1/2} = \frac{\ln 2}{\lambda}T1/2=λln2
−λ-\lambda−λ
Rate of nuclei decay, measured in Becquerels (Bq)
A=λNA = \lambda NA=λN
5730 years
6 hours
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