Abstract
In the determination of the accidental coincidence rate in two-fold fast- slow coincidence systems by Mayer-Kuckuk and Nierhaus, a correction must be made in using their method for calculating the chance rate of a two-fold fastslow circuit since their calculations apply to a three-fold circuit. In a two-fold system a term is needed for the finite resolving time of the fast coincidence circuit. This term is N/sup 12/ = 2t/sub f/N/sub 1/N/sub 2/, where 2t/sub f/ is the resolving time of the fa st coincidence circuit and N/sub 1/N/sub 2/ are the counting rates from the amplitude selectors. This term can be determined by inserting an appropriate delay in either input to the fast coincidence circuit. When estimating the nnagnitudes of the remaining accidental terms, those derived by MayerKuckuk and Nierhaus, the effect of dead times in the detectors and electronic circuitry before the slow coincidence circuit should not be neglected just in case the detector or circuitry is inoperative for an interval following an event. (N.W.R.)
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