【摘要】 正比计数器具有气体放大作用,很适合用于低能粒子探测。用于低能X射线和α/β污染监测时,正比计数器按充气方式可以划分为两大类:流气式和闭气式。与流气式相比,闭气式正比计数器使用方便;但是其寿命比较短,需要周期性更换工作气体。介绍了闭气式正比计数器性能老化问题,以及一种改善其换气周期的方法。更多还原

【Abstract】 Proportional counter can be used as low-energy particles detector because of its gas gain.According to charging manner,proportional counter can be divided into sealed and gas-flow proportional counters.Compared with gas-flow counter,although sealed proportional counter can be operated simply but it is short-lived,needs to replace the sealed gas periodically.It introduces the aging phenomenon of sealed proportional counter and a method for optimising the gas replacing period.更多还原