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| Conference Presentation (Invited) | FZJ-2024-03630 |
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2024
Abstract: Prompt Gamma Neutron Activation Analysis (PGNAA) based on cold or thermal neutron captureis a powerful technique for non-destructive elemental analysis of small and thin samples.However, due to limited penetration and attenuation effects, PGNAA is not suited for a preciseinvestigation of large objects. The feasibility of Prompt Gamma Analysis based on InelasticNeutron Scattering (PGAINS) to determine the elemental composition of large samples was alreadydemonstrated several decades ago [1]. The FaNGaS (Fast Neutron-induced Gamma-raySpectrometry) instrument, installed at Heinz Maier-Leibnitz Zentrum (MLZ) in 2014, advancesthis non-destructive analytical technique and makes it available for a broad community of industryand research [2-8]. Using the intense fission neutron beam delivered by the research reactorFRM II (Forschungs-Neutronenquelle Heinz Maier-Leibnitz) to investigate fast-neutroninduced prompt gamma-ray emission, it offers new possibilities for the chemical analysis oflarge or small samples as a complementary method to conventional thermal- or cold-neutronbased PGNAA. The predominant reaction channel of fast neutrons at FaNGaS is the (n,n’γ)inelastic scattering reaction, currently with only one existing database: the “Atlas of Gammaraysfrom the Inelastic Scattering of Reactor Fast Neutrons”, published in 1978 by Demidov etal. [9]. This data compilation is valuable and a relational database has been recently developedbased on this Atlas [10]. However, it was yet never validated and previous measurements withFaNGaS show the need for a critical and meticulous validation [3-6,8]. Apart from building upa comprehensive catalogue of (n,n’γ) reactions another main objective is a continuous optimizationof the instrument to improve the analytical sensitivity.In this talk the experimental set-upand technical specifications of FaNGaS will be given. Relative intensities and partial gammarayproduction cross sections of fast-neutron-induced prompt gamma rays derived from themeasurement of various elements will be presented along with literature comparisons.References1. Schrader CD, Stinner RJ (1961). J Geophys Res 66:1951–1956.2. Randriamalala TH et al. (2016). Nucl Instrum Methods A 806:370–377.3. Ilic Z et al. (2020). J Radioanal Nucl Chem 325:641–645.4. Mauerhofer E et al. (2021). J Radioanal Nucl Chem 331:535–546.5. Mauerhofer E et al. (2022. J Radioanal Nucl Chem 331:3987–4000.6. Ophoven N et al. (2022). J Radioanal Nucl Chem 331:5729–5740.7. Bouat S et al. (2021). Nondestruct Test Evaluation 37:1–13.8. Ophoven N et al. (2023). J Radioanal Nucl Chem (under review)9. Demidov A et al. (1978). Atomizdat, Moscow10. Hurst AM et al. (2021). Nucl Instrum Meth A 995:165095
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