Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Assaying of SNM using Simultaneous Detection of Fission Neutrons and Gammas by Employing a Novel Phoswich Detector

  • Sonu (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • Mohit Tyagi (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • A. Kelkar (Fuel Fabrication INRP(O), Nuclear Recycle Board, Bhabha Atomic Research Centre) ;
  • A. Sahu (Process Development Division, Bhabha Atomic Research Centre) ;
  • M. Sonawane (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • P.S. Sarkar (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • A. Pandey (Fuel Fabrication INRP(O), Nuclear Recycle Board, Bhabha Atomic Research Centre) ;
  • D.B. Sathe (Fuel Fabrication INRP(O), Nuclear Recycle Board, Bhabha Atomic Research Centre) ;
  • G.D. Patra (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • T. Vincent (Process Development Division, Bhabha Atomic Research Centre) ;
  • S.G. Singh (Technical Physics Division, Bhabha Atomic Research Centre) ;
  • R.B. Bhatt (Fuel Fabrication INRP(O), Nuclear Recycle Board, Bhabha Atomic Research Centre)
  • Received : 2022.09.26
  • Accepted : 2023.03.22
  • Published : 2023.07.25
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Abstract

For the precise measurements of special nuclear materials (SNM) including Pu and Am isotopes, we have used phoswich detector combination of two single crystal scintillators of Gd3Ga3Al2O12:Ce and CsI:Tl. High detection efficiency and sensitivity along with high figure of merit for the discrimination of these phoswich detectors ensures the detection and discrimination of thermal neutrons and gammas from spontaneous fission of Pu and other isotopes in presence of high gamma background. Using this detector, the low energy gammas, which is stopped completely in 1mm thick disc of GGAG, can be also discriminated from high energies gamma and shows linearity in wide range of sample quantities. By changing only the appropriate shielding, the similar setup was used for thermal neutron detection and shows a very good linearity over wide range. The quantity of a test sample was also calculated accurately by using the measured calibrated plot.

Keywords

References

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