Gaussian forming has good time, response and SNR, Gaussian shaping is widely used in nuclear signal processing because of its simple realization and good comprehensive performance. When working in high counting rate environment, the output pulse signal of nuclear detector often appears pile-up phenomenon, which leads to the nuclear spectrum measurement system cannot accurately extract the pulse amplitude, and then the energy spectrum measurement error. In order to solve this problem, a method of pulse pile-up identification and correction is proposed. A test system consisting of signal generator, detector, communication circuit and oscilloscope is designed. Experiments show that this method can accurately identification and correct the pile-up waveform., and increase count rate by 3%-30% compared with the traditional method.

Nuclear detector; CR-RC circuit; Pulse pileup identification; Pulse pileup correction

Chinese Academy of Science; Institute of High Energy Physics,Chinese Academy of Sciences