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Mean Lifetime

Applicable units are those of quantitykind:Time

The "Mean Lifetime" is the average length of time that an element remains in the set of discrete elements in a decaying quantity, $N(t)$.

http://en.wikipedia.org/wiki/Exponential_decay

http://www.iso.org/iso/catalogue_detail?csnumber=31895

$\tau = \frac{1}{\lambda}$, where $\lambda$ is the decay constant.

$\tau$