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<p>This study presents two key advancements in NaI (Tl) detector calibration. First, a novel low-energy, two-point source method is developed to estimate the unknown reflector thickness crucial for accurate NaI(Tl) detector modeling. Second, the full-energy-peak efficiency (FEPE) calibration and validation using point sources of (32–1332)&#xa0;keV energies is done to assess the activities of environmental samples. After investigating the reflector thickness’s impact on FEPE, the model is calibrated for extended sources to compute activity concentrations in standard water (ERx) and IAEA-327 soil. The measured and computed results agree within a 6% deviation, confirming the model’s applicability, particularly for measuring low-energy sources.</p>

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Estimation of NaI(Tl) detector reflector thickness and Geant4-based full-energy-peak efficiency calibration for extended sources

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Shahid Mansoor,
  • Khizar Hayat Satti,
  • Azhar Hussain Malik,
  • Asrar Ahmad,
  • Muhammad Tariq Siddique

摘要

This study presents two key advancements in NaI (Tl) detector calibration. First, a novel low-energy, two-point source method is developed to estimate the unknown reflector thickness crucial for accurate NaI(Tl) detector modeling. Second, the full-energy-peak efficiency (FEPE) calibration and validation using point sources of (32–1332) keV energies is done to assess the activities of environmental samples. After investigating the reflector thickness’s impact on FEPE, the model is calibrated for extended sources to compute activity concentrations in standard water (ERx) and IAEA-327 soil. The measured and computed results agree within a 6% deviation, confirming the model’s applicability, particularly for measuring low-energy sources.