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<p>This study utilizes a NaI detector and MCNP6 simulations to evaluate the influence of target characteristics on gamma-ray spectral distributions. Results indicate that increasing the aluminum target thickness from 0 to 3&#xa0;cm, the valley and Compton regions rose by up to 3.14 times at 383&#xa0;keV, while the photoelectric peak declined by 0.67 times at 1332&#xa0;keV. Furthermore, a Compton scattering peak at a 120° angle was identified at 383&#xa0;keV within lead shielding. Notably, as lead thickness increased from 1.0 to 4.0&#xa0;cm, peak 1 efficiency (Compton scattering peak) dropped 26 times, while peak 2 efficiency (photoelectric peak) decreased over 2514 times. Similarly, increasing target density from 10 to 14.5&#xa0;g/cm<sup>3</sup> reduced peak 1 by only 23% but peak 2 by over 96%. Additionally, increasing the target-to-detector distance diminished the Compton region, a phenomenon attributed to the build-up effect. These findings underscore the importance of shielding properties in industrial and medical applications.</p>

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Study on the influence of targets on spectral response in different regions using MCNP6

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Huynh Van Tran Sang,
  • Vu Ngoc Ba,
  • Nguyen Ba Doan Trinh,
  • Huynh Truc Van,
  • Phan Thi Xuan Mai,
  • Nguyen Quang Dao,
  • Tran Trung Nguyen,
  • Truong Thi Hong Loan

摘要

This study utilizes a NaI detector and MCNP6 simulations to evaluate the influence of target characteristics on gamma-ray spectral distributions. Results indicate that increasing the aluminum target thickness from 0 to 3 cm, the valley and Compton regions rose by up to 3.14 times at 383 keV, while the photoelectric peak declined by 0.67 times at 1332 keV. Furthermore, a Compton scattering peak at a 120° angle was identified at 383 keV within lead shielding. Notably, as lead thickness increased from 1.0 to 4.0 cm, peak 1 efficiency (Compton scattering peak) dropped 26 times, while peak 2 efficiency (photoelectric peak) decreased over 2514 times. Similarly, increasing target density from 10 to 14.5 g/cm3 reduced peak 1 by only 23% but peak 2 by over 96%. Additionally, increasing the target-to-detector distance diminished the Compton region, a phenomenon attributed to the build-up effect. These findings underscore the importance of shielding properties in industrial and medical applications.