为实现快速可靠连续测氡需要,基于静电收集法研制了一种新型连续测氡仪.该测量仪采用PIPS探测器对218Po产生的α粒子能量进行甑别,采用阈值自动调节方法消除温度对半导体探测器能谱峰的影响,采用温湿度自动补偿修正方法消除湿度对探测效率的影响,采用大流量取样和迭代修正方法实现可靠快速测量.测试结果表明:新型连续测氡仪10个连续测量周期的测量结果相对平均偏差在5%以内,能够快速响应氡浓度的变化,适应0 ~ 45℃环境温度的需要,经-20℃低温储存实验后该测氡仪能正常工作.
In order to measure radon rapidly and reliably, the continuous radon monitor which based on electro- static collection method was developed. The α - particles energy released from 218 Po was discriminated by PIPS detector and three single channels. Temperature's effect on the photo - peak efficiency of semiconductor detec- tor was eliminated by using the threshold automatic adjustment method,and humidity's effect on the detection efficiency was eliminated by the temperature/humidity self - compensation method. Meanwhile, the rapid and reliable measurement was achieved by using large flow capacity and iterative correction method. Results show that the relative average deviation of measurement result of novel continuous radon monitor for 10 consecutive measurement cycles is no more than 5% . It can quickly respond to the change of radon concentration and adapt to the needs of 0 - 45 ℃ environment temperature, After 20℃ blow temperature storage experiment minus the radon monitor is good.