Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (9): 90402-090402.doi: 10.11889/j.0253-3219.2018.hjs.41.090402


Real time digital pile-up reject based on pulse width analysis method

HUANG Qiang, YANG Lei, CHEN Zhen, XU Xiaoheng, ZHANG Mengchao, LI Dongcang   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2018-04-08 Revised:2018-05-24 Online:2018-09-10 Published:2018-09-12

Abstract: [Background] The pile-up effect of stochastic pulse could have detrimental impact to the nuclear energy spectrum acquisition system, and make the relevant nuclear energy spectral resolution even worse at high count rates.[Purpose] & [Methods] In order to restrain the adverse effect, we proposed pulse-width analysis method, which was based on the high speed digital sampling technique of full-pulse waveform, to real time distinguish and reject nuclear pulse pile-up signals at high count rates. In this sense, experiments were performed from both signal source and radioactive source to verify this method.[Results] The feasibility of this method had been proved on the basis of signal source of imitating nuclear radiation pulse. In the meantime, the γ rays of 60Co and 137Cs radioactive source were measured by using NaI scintillation detector under the experiment platform.[Conclusion] The results illustrate that pulse-width analysis method can continuously monitor the situation of pulse post-stacking events and leading-edge stacking events, and also has significant effect on improving the resolution of digital γ spectrometer at high count rates.

Key words: Pile-up discrimination, Pulse-width analysis, High count rates, Digital γ spectrometer

CLC Number: 

  • TL817+.2