A FPGA-based pulse pile-up rejection technique for the spectrum measurement in PGNAA

In this paper, a FPGA-based pulse pile-up rejection method for the high count rate gamma spectrometer of PGNAA is reported. By using fast peak seeking and feedback control, the pulse width can be narrowed then the pile-up events will be reduced. Test results shown that the energy resolution of the spectrometer is closed to the commercial products. For a count rate of 400 kHz, the number of pile-up events is reduced by 15.84%. This method is easy to implement in FPGAs for real-time data processing.