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Pulse pileup correction method for gamma-ray spectroscopy in high radiation fields

  • Lee, Minju (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Daehee (Fuze Laboratory, Agency for Defense Development) ;
  • Ko, Eunbie (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Kyeongjin (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Junhyuk (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Ko, Kilyoung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Sharma, Manish (Department of Nuclear Engineering, Khalifa University) ;
  • Cho, Gyuseong (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2019.08.07
  • Accepted : 2019.12.03
  • Published : 2020.05.25

Abstract

The detector suffers from pulse pileup by overlapping of the signals when it was used in high radiation fields. The pulse pileup deteriorates the energy spectrum and causes count losses due to random co-incidences, which might not resolve within the resolving time of the detection system. In this study, it is aimed to propose a new pulse pileup correction method. The proposed method is to correct the start point of the pileup pulse. The parameters are obtained from the fitted exponential curve using the peak point of the previous pulse and the start point of the pileup pulse. The amplitude at the corrected start point of the pileup pulse can be estimated by the peak time of the pileup pulse. The system is composed of a NaI (Tl) scintillation crystal, a photomultiplier tube, and an oscilloscope. A 61 μCi 137Cs check-source was placed at a distance of 3 cm, 5 cm, and 10 cm, respectively. The gamma energy spectra for the radioisotope of 137Cs were obtained to verify the proposed method. As a result, the correction of the pulse pileup through the proposed method shows a remarkable improvement of FWHM at 662 keV by 29, 39, and 7%, respectively.