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首页> 外文期刊>Medical Physics >CZT detectors used in different irradiation geometries: simulations and experimental results.
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CZT detectors used in different irradiation geometries: simulations and experimental results.

机译：用于不同辐射几何形状的CZT检测器：模拟和实验结果。

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The purpose of this work was to evaluate potential advantages and limitations of CZT detectors used in surface-on, edge-on, and tilted angle irradiation geometries. Simulations and experimental investigations of the energy spectrum measured by a CZT detector have been performed using different irradiation geometries of the CZT. Experiments were performed using a CZT detector with 10 x 10 mm2 size and 3 mm thickness. The detector was irradiated with collimated photon beams from Am-241 (59.5 keV) and Co-57 (122 keV). The edge-scan method was used to measure the detector response function in edge-on illumination mode. The tilted angle mode was investigated with the radiation beam directed to the detector surface at angles of 90 degrees, 15 degrees, and 10 degrees. The Hecht formalism was used to simulate theoretical energy spectra. The parameters used for simulations were matched to experiment to compare experimental and theoretical results. The tilted angle CZT detector suppressed the tailing of the spectrum and provided an increase in peak-to-total ratio from 38% at 90 degrees to 83% at 10 degrees tilt angle for 122 keV radiation. The corresponding increase for 59 keV radiation was from 60% at 90 degrees to 85% at 10 degrees tilt angle. The edge-on CZT detector provided high energy resolution when the beam thickness was much smaller than the thickness of CZT. The FWHM resolution in edge-on illumination mode was 4.2% for 122 keV beam with 0.3 mm thickness, and rapidly deteriorated when the thickness of the beam was increased. The energy resolution of surface-on geometry suffered from strong tailing effect at photon energies higher than 60 keV. It is concluded that tilted angle CZT provides high energy resolution but it is limited to a 1D linear array configuration. The surface-on CZT provides 2D pixel arrays but suffers from tailing effect and charge build up. The edge-on CZT is considered suboptimal as it requires small beam thickness and also suffers from charge buildup.
机译：这项工作的目的是评估在表面，边缘和倾斜角度照射几何形状中使用的CZT检测器的潜在优势和局限性。使用CZT的不同照射几何形状对CZT检测器测量的能谱进行了仿真和实验研究。使用尺寸为10 x 10 mm2，厚度为3 mm的CZT检测器进行实验。用来自Am-241（59.5 keV）和Co-57（122 keV）的准直光子束照射检测器。边缘扫描方法用于在边缘照明模式下测量探测器的响应功能。使用以90度，15度和10度的角度射向检测器表面的辐射束研究了倾斜角度模式。赫克特形式主义用于模拟理论能谱。用于仿真的参数与实验相匹配，以比较实验和理论结果。倾斜角CZT检测器抑制了光谱的拖尾，并且对于122 keV辐射，峰谷比从90度的38％增加到10度倾斜角的83％。 59 keV辐射的相应增加是从90度的60％增加到10度倾斜角的85％。当光束厚度远小于CZT的厚度时，边缘式CZT检测器可提供高能量分辨率。对于厚度为0.3 mm的122 keV光束，在边缘照明模式下的FWHM分辨率为4.2％，并且当光束厚度增加时，FWHM分辨率迅速下降。当光子能量高于60 keV时，表面几何形状的能量分辨率会遭受强烈的拖尾效应。结论是，倾斜角CZT可提供高能量分辨率，但仅限于一维线性阵列配置。表面上的CZT提供2D像素阵列，但会遭受拖尾效应和电荷累积的困扰。边缘导通的CZT被认为是次优的，因为它需要较小的光束厚度，并且还会产生电荷。

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