Average-life period (T) : As the total decay period of any of the element is infinity, it is meaningless to use term total decay period (total life period) for the radio elements. Therefore the term average life is taken inuse.

Average life (T) 

Average life (T) of an element is the inverse of its decay constant, i.e.,  Substituting the value of λ in the above equation,

Thus, Average life (T) 

Thus, the average life time of a radioisotope is approximately under-root two times of its half life period.

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