A Pulse Shape Analyzer for Phoswich Detectors

An electronic technique for separating the signals from a phoswich detector is discussed. The preamp output signal is amplified by two double delay line amplifiers operating in parallel. The time difference between the crossover points of the two amplifier output signals is measured. This time difference is a function of the detector pulse shape. For small pulses, this technique has less time jitter than the more usual leading edge/crossover measurement. It is also less sensitive to control misadjustments. An instrument based on this principle is described.