Posted by **Ali** on Monday, August 18, 2014 at 3:23pm.

Radioactive nuclei are produced in an irradiated sample at the rate of 10 s-1. If the number in the sample builds up to a maximum of 1000, calculate the mean life and the half-life of the radioactive nuclei

Using dN / dt = P - λ N

dN / dt = 1000n /10/ 1 = 100

P - λ N = 10 – λ 1000N

Half life is -

(In2) / λ = (In2) / 1000) = 6.93x10^-4 seconds

Not sure of mean life any advice appreciated ...

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