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DETECTION SYSTEM BUILT FROM COMMERCIAL INTEGRATED CIRCUITS FOR REAL-TIME MEASUREMENT OF RADIATION DOSE AND QUALITY USING THE VARIANCE METHOD

机译:商业集成电路构建的检测系统,采用方差法实时测量辐射剂量和质量

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摘要

A small, specialised amplifier using commercial integrated circuits (ICs) was developed to measure radiation dose and quality in real time using a microdosimetric ion chamber and the variance method. The charges from a microdosimetric ion chamber, operated in the current mode, were repeatedly collected for a fixed period of time for 20 cycles of 100 integrations, and processed by this specialised amplifier to produce signal pulse heights between 0 and 10 V. These signals were recorded by a multi-channel analyser coupled to a computer. FORTRAN programs were written to calculate the dose and dose variance. The dose variance produced in the ion chamber is a microdosimetric measure of radiation quality. Benchmark measurements of different brands of ICs were conducted. Results demonstrate that this specialised amplifier is capable of distinguishing differences of radiation quality in various high-dose-rate radiation fields including X rays, gamma rays and mixed neutron-gamma radiation from the research reactor at Texas A&M University Nuclear Science Center.
机译:开发了一种使用商业集成电路(IC)的小型专用放大器,以使用微剂量离子室和方差法实时测量辐射剂量和质量。在当前模式下运行的微剂量离子室的电荷在固定时间段内重复收集了20个周期(每100个积分),并由该专用放大器处理,以产生0至10 V的信号脉冲高度。由与计算机耦合的多通道分析仪记录。编写FORTRAN程序以计算剂量和剂量方差。在离子室中产生的剂量变化是辐射质量的微剂量测量。进行了不同品牌IC的基准测试。结果表明,这种专用放大器能够区分来自德州农工大学核科学中心研究堆的各种高剂量率辐射场(包括X射线,γ射线和混合中子-γ辐射)的辐射质量差异。

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