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On Tue 18 Feb, Mary Rack wrote: > Brian - half-life is a concept used whenever there is a condition called "exponential decay". > Mary > cg for mom 75/6 > [log in to unmask] > > Thanks Mary, you have put your finger on the part that ws botherng me: That is that Half-life definitions are really only appropriate to situations where a form of exponential decay is going on, such as in radioactivity. To apply the term to the CR tablet, where the designers have deliberately set out to achieve a constant rate of throughput seems to me to be a meaningless concept. Regards, -- Brian Collins <[log in to unmask]>