Hsu Wen-Hsing, Braby L A, Reece W D
Nuclear Science Center, Texas A&M University, 1095 Nuclear Science Road, 3575 TAMU, College Station, TX 77843, USA.
Radiat Prot Dosimetry. 2008;128(1):5-11. doi: 10.1093/rpd/ncm231. Epub 2007 May 24.
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.
开发了一种使用商用集成电路（IC）的小型专用放大器，用于通过微剂量电离室和方差法实时测量辐射剂量和质量。在电流模式下运行的微剂量电离室产生的电荷，在固定时间段内重复收集20个周期，每个周期进行100次积分，并由该专用放大器进行处理，以产生0至10 V之间的信号脉冲高度。这些信号由与计算机相连的多通道分析仪记录。编写了FORTRAN程序来计算剂量和剂量方差。电离室中产生的剂量方差是辐射质量的微剂量测量指标。对不同品牌的IC进行了基准测量。结果表明，这种专用放大器能够区分各种高剂量率辐射场中的辐射质量差异，这些辐射场包括X射线、γ射线以及来自德克萨斯A&M大学核科学中心研究堆的混合中子 - γ辐射。
