A simplified digital positron lifetime spectrometer based on a fast digital oscilloscope

A simplified digital positron lifetime spectrometer based on a fast digital oscilloscope
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基于快速数字示波器的简化数字正电子寿命谱仪

DOI:
10.1016/j.nima.2010.10.005
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发表时间:
2011
期刊:
Nuclear Instruments and Methods in Physics Research A
影响因子:
--
通讯作者:
Li Hui,ShaoYundong,ZhouKai,PangJingbiao,WangZhu
Li Hui,ShaoYundong,ZhouKai,PangJingbiao,WangZhu
中科院分区:
其他
文献类型:
--
作者:
Li Hui,ShaoYundong,ZhouKai,PangJingbiao,WangZhu

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本文介绍了一种简化的数字正电子寿命谱仪。该系统仅由两个闪烁探测器、一个延时器和一个数字示波器组成。通过对1.27MeV γ射线的正电子诞生信号和0.511MeV γ射线的正电子湮灭信号的时间差进行直方图,可以选择在线和离线两种方式对探测器信号进行分析,从而构造正电子寿命谱。提出了几种脉冲鉴别方法和定时数值算法,并成功地应用于脉冲能量鉴别和数字恒分数定时(DCFT)。采用脉冲幅度、脉冲上升时间和脉冲面积与脉冲幅度之比与DCFT相结合的鉴别方法,可以获得208ps的最佳时间分辨,优于采用相同探测器的模拟谱仪。这种新开发的装置除了具有更好的性能外,还特别容易构造和实施。
A simplified digital positron lifetime spectrometer is presented and tested. This system is only composed of two scintillation detectors, a time delayer and a digital oscilloscope. Both online and offline analysis of the detector signals can be optionally chosen to construct positron lifetime spectrum by histogramming the time difference between the positron birth signal of 1.27MeV γ-ray and one positron annihilation signal of 0.511MeV γ-rays. Several pulse discrimination methods and timing numerical algorithms are proposed and well applied to perform pulse energy discrimination and digital constant fraction timing (DCFT). A combination discrimination of pulse amplitude, pulse risetime and ratio of pulse area to pulse amplitude with DCFT is found able to achieve the best time resolution of 208ps full-width at half-maximum (FWHM), which is much better over the analog spectrometer using the same detectors. This newly developed apparatus except for having better performance is particularly easy to be constructed and implemented.
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