Nature 153, 165-165 (05 February 1944) | doi:10.1038/153165a0

Rate of n-fold Accidental Coincidences

L. JÁNOSSY

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THE rate of accidental coincidences between two Geiger counters is given by R2 = 2.N1.N2.t, where N1, N2 are the rates of the two single counters and t is the resolving time of the recorder. This formula is sometimes generalized for n-fold coincidences as Rn = N1.N2...Nn.(2t)n-1.
This formula is, however, incorrect and it should be replaced by Rn = n.N1.N3...Nn.tn-1 + terms in tn. .(1)