Multiple fast coincidence unit

Abstract

A fast diode coincidence unit which can be driven by photomultiplier pulses is described. The coincidence circuit can be changed from a double to a triple or quadruple by a switch. A resolving time, τ, of about 3 mμsec with 100% efficiency can be achieved. The dead time following non-coincident and coincident input pulses are about 16 and 70 mμsec respectively.