摘要
针对多路空气电离室剂量探测器输出信号的特点和测量需求,利用一种多路电荷灵敏积分型前置放大器专用器件(ASIC),实现了1 024路空气电离室剂量探测器的微小电流信号的同步放大、处理和采集。在6 MV(30 MU/min)医用加速器下,进行了实验测试,10 ms积分时间内,电荷量约为0.15 p C,测量灵敏度约为3 n C/Gy。结果表明,利用该种前置放大器构建的测量系统,其量程和积分时间等参数满足测量需要,可在该剂量测量系统中应用。
In this paper,the characteristics and measurement requirements of the output signal of a multi-channel air ionization chamber dose detector are focused. Using a multi-channel charge sensitive integrated preamplifier（ASIC）,the synchronous signal amplification,processing and acquisition of micro current signal from a 1 024-channel air ionization chamber dose detector are realized. The experiment was carried out under the 6 MV（30 MU/min） medical accelerator. The charge was about 0. 15 p C in 10 ms integral time and the sensitivity was about 3 n C/G. The results show that the measurement system with this preamplifier fits for the requirements,and can be used in the multi-channels dose measurement system.
作者
邢桂来
XING Gui-lai(Institute of Nuclear and New Energy Technology Tsinghua University, Beijing Key Laboratory of Nuclear Detection and Measurement, Beijing 100084, Chin)
出处
《核电子学与探测技术》
北大核心
2017年第8期802-805,共4页
Nuclear Electronics & Detection Technology
基金
清华大学自主科研计划(20151080374)资助
关键词
电荷灵敏
前放
多路
charge sensitive
front-end amplifier
multi-channel
