PLoS ONE (Jan 2021)

Simulation of the cement measurement based on the pulse DT neutron generator: A Monte Carlo study.

  • Yadong Gao,
  • Jiaming Li,
  • Jichen Li,
  • Linmao Liu

DOI
https://doi.org/10.1371/journal.pone.0252078
Journal volume & issue
Vol. 16, no. 6
p. e0252078

Abstract

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The PGNAA system for the cement measurement was simulated based on Monte Carlo method. The sizes of the moderator and reflector for the 14 MeV DT neutron generator were optimized for fast and thermal neutron outputs. The DT neutron generator was simulated at the pulse mode, and the gamma-ray detector was set as LaBr3(Ce) scintillator. The characteristic peaks of the major elements (Ca, Si, Al, Fe) can be identified from the gamma-ray spectra which induced at the different time intervals of the neutron radiation. For the different thicknesses of the cement sample the ratios of the gamma-ray peaks were observed, and the result showed that when the thickness was between 20 to 30 cm, the ratios became stable. With the ratios, we can calculate the iron modulus, silica modulus and lime saturation factor.