A counter is recording the arrival of radiation emitted from a sample
at random intervals of time and at a particular average count rate.
See how the
probability distribution P(r) of recording different numbers of counts r
in an interval of 1 second, builds up as we continue to count events.
Overlay the Poisson distribution
(Show Poisson) to see how the observations approach the expected form as N increases to a
large number.
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