Stabilizing scintillation detector systems by exploiting the temperature dependence of the light pulse decay time
Stabilizing scintillation detector systems by exploiting the temperature dependence of the light pulse decay time
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DOI：
10.1109/tns.2005.856616
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发表时间：
2005-12
影响因子：
1.8
通讯作者：
G. Pausch;J. Stein;N. Teofilov
中科院分区：
文献类型：
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作者：
G. Pausch;J. Stein;N. Teofilov
闪烁探测器在户外应用中必须能够承受大范围的环境温度和强温度斜率。这种苛刻的条件是所有国土安全应用的典型条件。一个有效的和高效的检测器稳定补偿温度相关的增益漂移是必不可少的，以保持能量校准和分辨率。可靠、完善的解决方案基于放射性参考源;然而，替代品的需求很大。对闪烁光输出的温度依赖性的增益偏移校正需要复杂的硬件和软件装置，而不需要参考源。强烈和快速的温度变化使情况进一步复杂化，因为在检测器中没有热平衡，而是温度场。本文提出了一种新的增益稳定技术，它通过分析探测器信号的平均脉冲形状来考虑有效闪烁体温度。脉冲形状与闪烁光衰减时间相关。该参数可以从数字化检测器信号在线提取。在没有放射性参考源的情况下，使用衰减时间数据来消除所有由温度确定的系统增益偏移。该技术已在广泛的气候室测量中得到验证。并对结果进行了讨论。
Scintillation detectors must tolerate a wide range of ambient temperatures and strong temperature slopes when used in outdoor applications. Such demanding conditions are typical for all homeland security applications. An effective and efficient detector stabilization compensating for temperature dependent gain shifts is essential to maintain energy calibration and resolution. Reliable, well-established solutions are based on radioactive reference sources; however, alternatives are much asked for. The gain shift correction for the temperature dependence of the scintillation light output requires elaborate hardware and software means without a reference source. Strong and rapid temperature changes further complicate the situation as there is no thermal equilibrium in the detector but rather a temperature field. This paper presents a new technique of gain stabilization which considers the effective scintillator temperature by analyzing the average pulse shape of detector signals. The pulse shape is correlated with the scintillation light decay time. This parameter can be extracted online from digitized detector signals. The decay time data are used to eliminate all the temperature determined system gain shifts without radioactive reference source. This technique has been verified in extensive climate chamber measurements. The results are discussed.