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<p>The Scan bed-SSWBM is a critical tool in monitoring internal contamination in individuals working in nuclear facilities. Its ability to detect high-energy photon emitting radionuclides makes it an essential device in ensuring the safety and well-being of workers in these facilities. Most of the SSWBM systems in India utilize a 102&#xa0;mm diameter and 76&#xa0;mm thick NaI(Tl) scintillation detector. As awareness about radiation safety continues to grow, there is a pressing demand to improve the sensitivity of detecting radioactivity in individuals. The response of the detector in SSWBM is complex due to its intricate shield structure, making it difficult to optimize detection performance. To address this limitation, a study was conducted to explore the potential benefits of using a larger detector size. The study focused on evaluating the performance of a 203&#xa0;mm diameter and 102&#xa0;mm thick NaI(Tl) detector with the goal to determine if a larger detector size could enhance the sensitivity of detection. The study focused on examining the effects of detector size and shield design on three crucial parameters that influence radiation detection mainly background, efficiency and Minimum Detectable Activity (MDA). The study utilized the BARC reference BOttle Mannequin ABsorption (BOMAB) phantom, a standardized phantom designed to simulate / mimic the human body. The results demonstrates that by making minimal modifications to the detector shield design and switching to a larger detector size, the current Minimum Detectable Activity (MDA) can be achieved within half the typical counting time. This study highlights the benefits of incorporating larger detectors, which can lead to lower detection levels or increased throughput as required.</p>

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Performance Evaluation of Shadow Shield Whole Body Monitor Equipped with Large Sized NaI(Tl) Detector

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Rajesh Sankhla,
  • I. S. Singh,
  • Pramilla D. Sawant,
  • M. S. Kulkarni,
  • Probal Chaudhury

摘要

The Scan bed-SSWBM is a critical tool in monitoring internal contamination in individuals working in nuclear facilities. Its ability to detect high-energy photon emitting radionuclides makes it an essential device in ensuring the safety and well-being of workers in these facilities. Most of the SSWBM systems in India utilize a 102 mm diameter and 76 mm thick NaI(Tl) scintillation detector. As awareness about radiation safety continues to grow, there is a pressing demand to improve the sensitivity of detecting radioactivity in individuals. The response of the detector in SSWBM is complex due to its intricate shield structure, making it difficult to optimize detection performance. To address this limitation, a study was conducted to explore the potential benefits of using a larger detector size. The study focused on evaluating the performance of a 203 mm diameter and 102 mm thick NaI(Tl) detector with the goal to determine if a larger detector size could enhance the sensitivity of detection. The study focused on examining the effects of detector size and shield design on three crucial parameters that influence radiation detection mainly background, efficiency and Minimum Detectable Activity (MDA). The study utilized the BARC reference BOttle Mannequin ABsorption (BOMAB) phantom, a standardized phantom designed to simulate / mimic the human body. The results demonstrates that by making minimal modifications to the detector shield design and switching to a larger detector size, the current Minimum Detectable Activity (MDA) can be achieved within half the typical counting time. This study highlights the benefits of incorporating larger detectors, which can lead to lower detection levels or increased throughput as required.