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<p>This study introduces a novel trapezoidal geometry for thermal neutron detection, employing silicon as the detecting substrate and boron carbide (B₄C) as the neutron converter material. The system leverages the well-established <sup>10</sup>B(n, α)<sup>7</sup>Li reaction for neutron capture. Comprehensive simulations using the Geant4 toolkit were conducted to determine the optimum converter dimensions, with particular focus on identifying a critical width that maximizes detection efficiency. A peak efficiency of 11.9% was attained at a converter width of 8.4&#xa0;µm, corresponding to an active area of 70.56 µm<sup>2</sup>, using 100% enriched <sup>10</sup>B. The influence of varying boron enrichment levels, ranging from 20 to 100%, on detection efficiency was systematically evaluated. Furthermore, the role of the low-level discriminator (LLD) threshold, varied from 100 to 800&#xa0;keV, was examined to understand its effect on signal discrimination and overall detector performance. Histoplot analyses were employed to assess the energy resolution across different converter widths (0.2&#xa0;µm and 1.5&#xa0;µm), providing insights into the optimization of geometric parameters for enhanced spectral response. The findings offer a pathway toward the development of efficient, solid-state neutron detectors optimized for thermal neutron environments.</p>

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Enhanced Neutron Detection Efficiency with a Trapezium-Shaped Boron Carbide Converter Coupled with a Silicon Detector

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Avinash Nayak,
  • Bijayinee Biswal,
  • Manoj Kumar Parida

摘要

This study introduces a novel trapezoidal geometry for thermal neutron detection, employing silicon as the detecting substrate and boron carbide (B₄C) as the neutron converter material. The system leverages the well-established 10B(n, α)7Li reaction for neutron capture. Comprehensive simulations using the Geant4 toolkit were conducted to determine the optimum converter dimensions, with particular focus on identifying a critical width that maximizes detection efficiency. A peak efficiency of 11.9% was attained at a converter width of 8.4 µm, corresponding to an active area of 70.56 µm2, using 100% enriched 10B. The influence of varying boron enrichment levels, ranging from 20 to 100%, on detection efficiency was systematically evaluated. Furthermore, the role of the low-level discriminator (LLD) threshold, varied from 100 to 800 keV, was examined to understand its effect on signal discrimination and overall detector performance. Histoplot analyses were employed to assess the energy resolution across different converter widths (0.2 µm and 1.5 µm), providing insights into the optimization of geometric parameters for enhanced spectral response. The findings offer a pathway toward the development of efficient, solid-state neutron detectors optimized for thermal neutron environments.