基于ARM的软件延迟符合法氡同位素分辨测量实验系统研制

摘要

The software delayed coincidence counting technology was researched based on embedded system. The device based on ARM processor was constructed to record time serials information of nuclear pulse. According to the different half-lifes of Po short-life daughters of radon isotopes, a method of software delayed coincidence counting was used to discriminate radon isotopes. Experiment results of 220Rn and 219Rn standard source measurement show that the software delayed coincidence counting method is practical for discrimination measurement of low level activity of radon isotopes. The software method is an alternative to hardware one, and it can offer better convenience and flexibility.%本文探讨了一种基于嵌入式系统的软件延迟符合分辨测量氡同位素技术,建立基于ARM嵌入式微处理器试验装置,记录核脉冲序列的时序信息,利用氡同位素的短寿命子体钋半衰期不同的特性,用一种软件延迟符合测量法分辨测量了219Rn和220Rn源.实验结果表明,软件延迟符合系统能分辨测量低水平219 Rn和220Rn,操作简便,达到了设计目的.