Exploring the limiting timing resolution for large volume CZT detectors with waveform analysis
Exploring the limiting timing resolution for large volume CZT detectors with waveform analysis
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DOI：
10.1016/j.nima.2005.04.076
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发表时间：
2005-09-11
影响因子：
1.4
通讯作者：
He, Z
中科院分区：
文献类型：
--
作者：
Meng, LJ;He, Z
本文介绍了一项探索大体积三维位置敏感CZT探测器所能达到的极限时间分辨率的研究。通过将测量的阴极波形与预定义的波形模型进行拟合来获得相互作用时序信息。我们比较了几种不同波形模型的结果。通过对阴极波形作为相互作用位置和能量沉积的函数的详细建模，获得了时间分辨率，对于511keV全能量事件，类似于9.5 ns，对于所有能量沉积超过250keV的检测事件，类似于11.6 ns。这种详细的建模还允许我们推导出估计相互作用时间的误差的理论下限。实验结果与理论预测吻合较好，表明在测试的1 cm(3)CZT探测器上所能达到的最佳时间分辨率接近10us。结果还表明，阴极波形中采样幅度之间的相关性是实现定时分辨率的一个重要限制因素。(C)2005 Elsevier B.V.保留所有权利。
This paper presents a study for exploring the limiting timing resolution that can be achieved with a large volume 3-D position sensitive CZT detector. The interaction timing information was obtained by fitting the measured cathode waveforms to pre-defined waveform models. We compared the results from using several different waveform models. Timing resolutions, of similar to 9.5 ns for 511 keV full-energy events and similar to 11.6 ns for all detected events with energy deposition above 250 keV, were achieved with a detailed modeling of the cathode waveform as a function of interaction location and energy deposition. This detailed modeling also allowed us to derive a theoretical lower bound for the error on estimated interaction timing. Both experimental results and theoretical predications matched well, which indicated that the best timing resolution achievable in the 1 cm(3) CZT detector tested is similar to 10 us. It is also showed that the correlation between sampled amplitudes in cathode waveforms is an important limiting factor for the achievable timing resolution. (c) 2005 Elsevier B.V. All rights reserved.