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| Conference Presentation (Invited) | FZJ-2024-03631 |
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2024
Abstract: Prompt Gamma Neutron Activation Analysis (PGNAA) is a powerful technique to determinethe elemental compositions of samples of various origins. It measures the emitted promptgamma rays due to neutron capture which have an isotope specific energy. The comparisonof the emission rate of different gamma ray lines allows thus to determine the concentrationin a homogenous sample very precisely. For inhomogeneous samples the gamma line emissionrate depends on the exact elemental distribution within the sample probed as the neutronflux and therefore the gamma yield changes due to neutron scattering and neutron absorption.A precise determination of the elemental composition is thus not possible for inhomogeneoussamples with classical PGNAA methods. A way to improve PGNAA is to use the capabilitiesof pulsed neutron sources which are becoming more common. As neutrons with differentenergies probe different volumes within a sample, the correlation of the neutron energy to thetime resolved gamma spectra allows an indirect access to depth resolved information of theelemental composition. By extending PGNAA with a Time-of-Flight (TOF) option, informationabout the homogeneity as well as depth resolved elemental composition can be obtained.We will present OpenMC simulations as well as an experimental investigation done atthe RANS source in RIKEN [1]. We will show the results for an idealized sample based ona layered structure where the position of an inhomogeneity can be changed. The simulationas well as the experiment show that it is possible to access depth resolved information andthus improve the determination of the elemental composition in an inhomogeneous sample.References1. Y. Otake, et al., "Research and Development of a Non-destructive Inspection Technique with aCompact Neutron Source", Journal of Disaster Research Vol.12, No.3, (2017) pp.585–592.
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