Triple-Coincidence with Automatic Chance Coincidence Correction

The chance coincidences in a triple-coincidence circuit are of two types - partially correlated and entirely uncorrelated. Their relative importance depends on source strength and source and detector geometry so that the total chance correction cannot, in general, be calculated. The system to be described makes use of several delays and straightforward integrated circuit logic to provide independent evaluation of the two components of the chance coincidence rate.