Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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A new approach for modeling pulse height spectra of gamma-ray detectors from passing radioactive cloud in a case of NPP accident

  • R.I. Bakin (Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN)) ;
  • A.A. Kiselev (Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN)) ;
  • E.A. Ilichev (Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN)) ;
  • A.M. Shvedov (Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN))
  • Received : 2021.06.21
  • Accepted : 2022.08.11
  • Published : 2022.12.25
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Abstract

A comprehensive approach for modeling the pulse height spectra of gamma-ray detectors from passing radioactive cloud in a case of accident at NPP has been developed. It involves modeling the transport of radionuclides in the atmosphere using Lagrangian stochastic model, WRF meteorological processor with an ARW core and GFS data to obtain spatial distribution of radionuclides in the air at a given moment of time. Applying representation of the cloud as superposition of elementary sources of gamma radiation the pulse height spectra are calculated based on data on flux density from point isotropic sources and detector response function. The proposed approach allows us to obtain time-dependent spectra for any complex radionuclide composition of the release. The results of modeling the pulse height spectra of the scintillator detector NaI(Tl) Ø63×63 mm for a hypothetical severe accident at a NPP are presented.

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References

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