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<p>Neutron Activation Analysis is a non-destructive and highly sensitive technique with potential applications in nuclear safeguards verification. This study evaluates the suitability of a training reactor for safeguards-focused NAA through experimental neutron flux profiling. Gold and dysprosium activation foils and wires were irradiated at the BME Training Reactor, and gamma-ray spectrometry was used to quantify induced activity. Results showed a peak thermal neutron flux of approximately (2.5 ± 0.18) × 10<sup>11</sup> n/cm <sup>2 </sup>/s, an axial flux profile consistent with diffusion theory, and reflector savings of 5.5–7&#xa0;cm. These findings confirm that the reactor provides a well-moderated thermal neutron field exceeding IAEA threshold for safeguards-relevant NAA. The results establish benchmark flux data for training reactor environments and demonstrate their capacity to support safeguards verification by enabling detection of sub-milligram quantities of U-235 and Pu-239.</p>

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Neutron flux profiling as a benchmark for the applicability of neutron activation analysis in nuclear safeguards at a training reactor

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Adjoa Amponfi

摘要

Neutron Activation Analysis is a non-destructive and highly sensitive technique with potential applications in nuclear safeguards verification. This study evaluates the suitability of a training reactor for safeguards-focused NAA through experimental neutron flux profiling. Gold and dysprosium activation foils and wires were irradiated at the BME Training Reactor, and gamma-ray spectrometry was used to quantify induced activity. Results showed a peak thermal neutron flux of approximately (2.5 ± 0.18) × 1011 n/cm 2 /s, an axial flux profile consistent with diffusion theory, and reflector savings of 5.5–7 cm. These findings confirm that the reactor provides a well-moderated thermal neutron field exceeding IAEA threshold for safeguards-relevant NAA. The results establish benchmark flux data for training reactor environments and demonstrate their capacity to support safeguards verification by enabling detection of sub-milligram quantities of U-235 and Pu-239.