Performance evaluation of a depth-of-interaction detector by use of position-sensitive PMT with a super-bialkali photocathode
Performance evaluation of a depth-of-interaction detector by use of position-sensitive PMT with a super-bialkali photocathode
复制标题
使用具有超双碱光电阴极的位置敏感 PMT 来评估交互深度探测器的性能
DOI：
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发表时间：
2013
影响因子：
1.6
通讯作者：
T. Yamaya
中科院分区：
文献类型：
--
作者：
Y. Hirano;M. Nitta;N. Inadama;F. Nishikido;E. Yoshida;H. Murayama;T. Yamaya
在这项工作中，我们的目的是通过将位置敏感光电倍增管（PMT）与标准双碱光电阴极（BA）在识别闪烁晶体、能量分辨率和时间分辨率方面的能力进行比较，来评估由GSO晶体组成的4层相互作用深度（DOI）探测器的性能。4层DOI探测器由16 × 16阵列2.9 × 2.9 × 7.5 mm3 GSO晶体和8 × 8多阳极阵列型位置敏感PMT组成。DOI采用反射器控制法实现，相互作用点采用Anger法计算。顶层（离PMT最远）在511 keV能量下的半最大全宽能量分辨率（FWHM）有所提高，SBA的能量分辨率为12.0%，BA的能量分辨率为12.7%。作为晶体识别能力的指标，计算了峰谷比和距离宽度比；后者被定义为峰间距离的平均值/峰宽的平均值。对于这两个指标，都获得了几个百分点的改进；峰谷比从1.78 （BA）增加到1.86 (SBA)，距离宽度比从1.47 （BA）增加到1.57 （SBA）。底层的时序分辨率（FWHM）略有提高，从2.5 ns （BA）提高到2.4 ns （SBA）。使用超双碱光电阴极有望提高DOI探测器的性能。
Our purpose in this work was to evaluate the performance of a 4-layer depth-of-interaction (DOI) detector composed of GSO crystals by use of a position-sensitive photomultiplier tube (PMT) with a super-bialkali photocathode (SBA) by comparing it with a standard bialkali photocathode (BA) regarding the ability to identify the scintillating crystals, energy resolution, and timing resolution. The 4-layer DOI detector was composed of a 16 × 16 array of 2.9 × 2.9 × 7.5 mm3 GSO crystals for each layer and an 8 × 8 multi-anode array type position-sensitive PMT. The DOI was achieved by a reflector control method, and the Anger method was used for calculating interacting points. The energy resolution in full width at half-maximum (FWHM) at 511 keV energy for the top layer (the farthest from the PMT) was improved and was 12.0 % for the SBA compared with the energy resolution of 12.7 % for the BA. As indicators of crystal identification ability, the peak-to-valley ratio and distance-to-width ratio were calculated; the latter was defined as the average of the distance between peaks per the average of the peak width. For both metrics, improvement of several percent was obtained; for example, the peak-to-valley ratio was increased from 1.78 (BA) to 1.86 (SBA), and the distance-to-width ratio was increased from 1.47 (BA) to 1.57 (SBA). The timing resolution (FWHM) in the bottom layer was improved slightly and was 2.4 ns (SBA) compared with 2.5 ns (BA). Better performance of the DOI detector is expected by use of a super bialkali photocathode.
影响因子：
3.8
作者：
Bircher, Chad;Shao, Yiping
通讯作者：
Shao, Yiping