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To monitor the integral dose deposited in the BESⅢ electromagnetic calorimeter whose performance degrades due to exposure to the BEPC Ⅱ background, a 400 nm IMPL RadFET dosimeter-based integral dose online monitor system is built, After calibration with the ^60Co source and verification with TLD in the pulse radiation fields, an experiment was arranged to measure the BEPC Ⅱ background online. The results are presented. 相似文献
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RADFET~多通道探测器将要用来测量北京谱仪BESⅢ中量能器附近的累计剂量. 探测器的技术关键是对400nmIMPL RADFET剂量计具体性能的了解和掌握. 本工作以60Co γ源为辐射源, 实验研究了400nm IMPL RADFET剂量计的各项性能, 包括RADFET通道间的一致性、测量累积剂量时的辐照强度相关性以及退火特性等, 同时也讨论了测量数据的拟合方法, 为该类型RADFET剂量计在RADFET多通道探测器的设计、建造和其他方面的应用提供了实验基础. 相似文献
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Silicon photomultipliers (SiPMs) have remarkable advantages for use in photo-detection. Compared with PMT, SiPM shows advantages of high gain, excellent time resolution, insensitivity to magnetic fields and a lower operating voltage. SiPMs from Hamamatsu are used in the electromagnetic calorimeter (ECAL) sub-detector in the Positron Electron Balloon Spectrometer (PEBS) experiment, a balloon-borne spectrometer experiment aiming at the precise measurement of the cosmic-ray positron fraction. This paper introduces the evaluation and test results of several SiPM detector types, the dedicated front-end application specific integrated circuit (ASIC) electronics and the design of the data acquisition system (DAQ) system. 相似文献
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