Abstract
We investigate the feasibility of using low energy gamma rays from neutron capture to localize slabs inside samples. A new system based on two gamma ray detectors with 2D collimators to be tested at the INES beamline at the pulsed neutron source ISIS (Oxford, UK) is described. The system provides a localization of slabs inside extended samples by using gamma ray self-absorption. Geant4 Monte Carlo simulations of the beamline were carried out to model gamma spectra from test samples.
Highlights
Neutron capture prompt gamma activation analysis (PGAA) is a non-destructive analytical technique that provides information on the isotopic composition in samples
The feasibility of using low energy gamma rays from neutron capture to localize metallic slabs inside a sample has been investigated with Monte Carlo simulations
A detection system consisting of two back-to-back gamma ray detectors with two 2D collimators has been proposed
Summary
Neutron capture prompt gamma activation analysis (PGAA) is a non-destructive analytical technique that provides information on the isotopic composition in samples. It based on the measurements of gamma-rays following neutron capture. Using two back-to-back detectors on opposite sides of the sample we can measure the ratio of the gamma-ray intensities and calculate the approximate position of the slab. Spatial distribution of elements has recently been measured by scanning a sample with a collimated neutron beam and by using a collimated gamma detector [3]. The method describes in this paper, will make use of the full neutron beam area and allow for a fast localization of the slabs along the direction where the gamma-ray detectors are placed. This study has been performed with Monte Carlo simulations based on the GEANT4 code [4, 5]
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