Nuclear Engineering and Technology

  • 제52권6호
  • /
  • Pages.1266-1270
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  • 2020
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Coincidence summing correction for a voluminous 152Eu source

  • Yoon, Eun Taek (Department of Nuclear Engineering, Seoul National University) ;
  • Kang, Min Young (Department of Nuclear Engineering, Seoul National University) ;
  • Kim, In Jung (Department of Nuclear Engineering, Seoul National University) ;
  • Sun, Gwang Min (Department of Nuclear Engineering, Seoul National University) ;
  • Choi, Hee-Dong (Department of Nuclear Engineering, Seoul National University)
  • 투고 : 2019.08.26
  • 심사 : 2019.11.18
  • 발행 : 2020.06.25
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초록

A code is developed to correct for the coincidence summing effect in detecting a voluminous gamma source, and this code is applied to a152Eu standard source as a test case. The source is 1000 mL of liquid in a cylindrical shape. To calculate the coincidence summing effect, the cylindrical source is considered as 10(radial) × 8(height) sectional sources. For each sectional source, the peak efficiency and total efficiency are obtained by Monte Carlo simulation at each energy for 10 energies between 50 keV and 2000 keV. The efficiencies of each sector are then expressed as polynomials of gamma energy. To calculate the correction coefficients for the coincidence summing effect, the KORSUM code is used after modification. The magnitudes of correction are 4%-17% for the standard 152Eu source measured in this study. The relative deviation of 4.7% before the coincidence correction is reduced to 0.8% after the correction is applied to the efficiency based on the measured gamma line. Hence, this study has shown that a new method has been developed that is applicable for correcting the coincidence effect in a voluminous source, and the method is applied to the measured data of a standard 152Eu cylinder source.

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참고문헌

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  1. Peak Efficiency of NaI Detector and Coincidence Summing Factor for Different Cylindrical Sources Using Geant4 Simulation vol.121, pp.3, 2020, https://doi.org/10.1097/hp.0000000000001437
  2. Geant4 Tracks of NaI Cubic Detector Peak Efficiency, Including Coincidence Summing Correction for Rectangular Sources vol.195, pp.9, 2020, https://doi.org/10.1080/00295639.2021.1895406
  3. Re-construction of a HPGe detector precise modeling for efficiency calibration vol.180, 2022, https://doi.org/10.1016/j.apradiso.2021.110059