The distinctive features of a well-known NaI(Tl) scintillation detector, by virtue of its crystal size, are experimentally investigated by observing changes in parameters such as intrinsic efficiency (εi), photo-peak efficiency (εp), resolution, and response function to incident gamma photon energy. This study provides a better understanding for the choice of crystal size of the scintillation detector in Compton scattering experiments. The response function of the NaI(Tl) detector is in the form of an inverse matrix focusing on the retort of the crystal when gamma photons are incident upon it. The response function of the NaI(Tl) detector depends upon the distance between the source and the detector, composition of the material for the crystal itself, photo-fraction, solid angle, incident gamma energy, and geometry of the experimental setup. The factors responsible for broadening of full energy and backscattered peaks are discussed for present investigations. The observed results indicate that the resolution of the detector varies with the incident energy of gamma radiation, and it also depends upon the size of the crystal of the detector. Statistical fluctuations related with the scintillation mechanism are found to be responsible for broadening of instrumental line width (photo-peak). The signal-to-noise ratio and photo-fraction for different crystal sizes of the scintillation detector corrected for efficiency of the detector are also discussed.

中文翻译：

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NaI(Tl)闪烁探测器中间晶体尺寸对比研究

通过观察固有效率 (εi)、光峰效率 (εp)、分辨率和响应等参数的变化，对众所周知的 NaI(Tl) 闪烁探测器的独特特征进行了实验研究入射伽马光子能量的函数。本研究为康普顿散射实验中闪烁探测器晶体尺寸的选择提供了更好的理解。当伽马光子入射到晶体上时，NaI(Tl) 探测器的响应函数采用逆矩阵的形式，集中在晶体的蒸馏器上。NaI(Tl) 探测器的响应函数取决于源和探测器之间的距离、晶体本身的材料成分、光分数、立体角、入射伽马能量和实验装置的几何形状。目前的研究讨论了导致全能量和反向散射峰变宽的因素。观察结果表明，探测器的分辨率随伽马辐射的入射能量而变化，还取决于探测器晶体的尺寸。发现与闪烁机制相关的统计波动是仪器线宽（光峰）变宽的原因。还讨论了针对不同晶体尺寸的闪烁探测器的信噪比和光分数，并针对探测器的效率进行了校正。并且还取决于探测器晶体的大小。发现与闪烁机制相关的统计波动是仪器线宽（光峰）变宽的原因。还讨论了针对不同晶体尺寸的闪烁探测器的信噪比和光分数，并针对探测器的效率进行了校正。这也取决于探测器晶体的大小。发现与闪烁机制相关的统计波动是仪器线宽（光峰）变宽的原因。还讨论了针对不同晶体尺寸的闪烁探测器的信噪比和光分数，并针对探测器的效率进行了校正。