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    • Calculation of True Coincidence Summing Correction Factor for Clover Detector in Add-Back and Direct Mode

    Ashish Gupta,M. Shareef,Munmun Twisha,Saikat Bhattacharjee,A. Mukherjee

    arXiv (Cornell University)（2023）

    𝑎 Saha Institute of Nuclear Physics | Bidhan Nagar | 𝑏 Homi Bhabha National Institute | National Institute of Technology Calicut Department of Physics

    Cited 0|Views13
    Abstract
    The true coincidence summing effect on the full-energy peak efficiency calibration of an unsuppressed clover HPGe detector has been studied. Standard multi-energetic and mono-energetic gamma-ray sources were used to determine the full-energy peak efficiency of the detector as a function of the gamma-ray energies at different source-to-detector distances. The true coincidence summing correction factors for the full-energy peak efficiency of the detector has been determined, in the add-back and direct modes of the detector, using both experimental and analytical methods. Geant4 simulations were performed to obtain the full-energy peak efficiency and total efficiency of the detector for different gamma-ray energies. The simulated efficiencies were used to calculate the correction factors using the analytical method. The correction factors obtained from both analytical and experimental methods were found to be in good agreement with each other. The clover detector in add-back mode exhibits larger summing corrections compared to the direct mode for the same source-to-detector distances. For the add-back mode, the coincidence summing effect is not significant for source-to-detector distances 13 cm or above, whereas, for the direct mode, measurements can be performed for source-to-detector distances 5 cm or above without considering the coincidence summing effect.
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    【要点】：论文研究了未抑制的Clover HPGe探测器在加回模式和直接模式下全能量峰效率校准中的真实符合相加效应，并确定了相应的校正因子，创新点在于结合实验和解析方法确定了加回和直接模式下探测器的校正因子。
    

    【方法】：使用标准多能量和单能量伽马射线源，通过实验和解析方法确定探测器在不同源-探测器距离下的全能量峰效率。
    

    【实验】：通过实验和Geant4模拟，使用标准多能量和单能量伽马射线源在不同源-探测器距离下进行测量，得到了加回模式和直接模式下探测器的全能量峰效率和总效率，实验数据集名称未提及。实验结果表明，加回模式下的符合相加效应比直接模式更显著，且在源-探测器距离13厘米或以上时可以忽略，而在直接模式下，在源-探测器距离5厘米或以上时可以不考虑符合相加效应。
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