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STUDY OF OPERATION CHARACTERISTICS OF LIQUID XENON PHOTOIONIZATION DETECTORS

液氙光离子化探测器工作特性研究

基本信息

批准号：
07650070
负责人：
MASUDA Kimiaki
金额：
$ 1.47万
依托单位：
SAITAMA COLLEGE OF HEALTH
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650070/
关键词：
Rare Gas Liquid Radiation Detector Photoionization Attenuation Length

项目摘要

Rare gas liquids have good properties both for ionization and scintillation as radiation detectors. It has been shown that these can be excellent detectors when ionization and scintillation are simultaneously utilized. Photoionization is one of the methods. In this method, photons from rare gas liquid molecules are absorbed by doped organic molecule and ionized the molecule. Thus scintillation is converted to ionization. One of important characteristics of the photoionization detectors is time stability, which we measured in this study.We measured the stability of allene doped liquid argon for more than 60 hours. Amount of collected charge varied with time. Although the absolute charge decreases, it gradually collected charge varied with time. Although the absolute charge decreases, it gradually approachs to the charge amount of pure liquid argon and does not reduce to less than the level. This means that the concentration of allene decreases with time. Measurement of attenuation length of drifting electrons showed concentration of electronegative impurity also decreases. As a results, effective abount of mixed molecules, whether it is desired or undesired, decreases with time.It was found that, in trimethylamine (TMA) doped liquid, xenon, undesired electronegative impurity was introduced together with TMA to the liquid. This can be avoided by purify TMA at low temperature as -110ﾟC and operating detectors also at the temperature. In this way, the collected charge of TMA doped liquid xenon does not change for more than 50 hours.In conclusion, it has been shown that rare gas liquid ionization detectors can be opetated stably.

稀有气体液体作为辐射探测器具有良好的电离和闪烁特性。事实证明，当同时使用电离和闪烁时，这些可以成为出色的探测器。光电离是方法之一。在该方法中，来自稀有气体液体分子的光子被掺杂的有机分子吸收并将该分子电离。因此闪烁转化为电离。光电离探测器的重要特性之一是时间稳定性，我们在本研究中测量了时间稳定性。我们测量了丙二烯掺杂液氩的稳定性超过 60 小时。收取的费用金额随时间而变化。虽然绝对电荷减少，但随着时间的推移，它逐渐收集了变化的电荷。虽然绝对电荷量减少，但逐渐接近纯液氩的电荷量，并且不会降低到低于该水平。这意味着丙二烯的浓度随着时间而降低。漂移电子衰减长度的测量表明负电性杂质的浓度也降低。结果，混合分子的有效量，无论是期望的还是不期望的，都会随着时间而减少。发现，在三甲胺(TMA)掺杂液体中，氙、不期望的电负性杂质与TMA一起被引入到液体中。这可以通过在 -110°C 的低温下纯化 TMA 并在该温度下操作检测器来避免。这样，TMA掺杂液态氙所收集的电荷在50小时以上不会发生变化。综上所述，稀有气体液态电离探测器可以稳定运行。