氡钍射气连续测量装置的研制及其现场验证  

Development and On-site Test of Radon-thoron Continuous Monitoring Device

作　　者：刘啸晨 杨明理[1] 王攀[1] 初旭阳 LIU Xiaochen;YANG Mingli;WANG Pan;CHU Xuyang(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2023年第3期69-74,106,共7页Uranium Mining and Metallurgy

摘　　要：氡与钍射气的连续甄别测量是辐射防护领域的重要课题,能够为氡钍射气混合环境中内照射剂量的准确估算提供数据支撑。使用改进的ZnS闪烁室,基于延迟计数法,构造了氡与钍射气连续监测方法的试验装置,在实验室与现场进行了不同条件下的测试,并将测试结果与平行组Alpha Guard DF2000的测试结果进行了比较。结果表明,当氡与钍射气的浓度比大于1∶30时,试验装置对2种核素的测量结果与DF2000的测量结果相比,偏差均小于10%,且长期监测结果不受前序周期遗留物的干扰。研制的氡钍射气连续测量装置可准确测量氡与钍射气的放射性浓度。The continuously discriminative monitoring of radon and thoron is a significant project in the realm of radiation protection,which can provide statistical supports for the accurate estimation of internal exposure dose in radon-thoron hybrid environment.Using the improved ZnS scintillation cells and based on the delay count method(DCM),an experimental device for radon-thoron continuous monitoring has been devised.This device has been tested under both laboratorial and on-site conditions,the measurement results from this device were compared with that from Alpha Guard DF2000.As a result,the deviations of the measurement values of this device and Alpha Guard DF2000are less than10%for both radon and thoron even when the radioactive concentrations of radon and thoron differ drastically(the ratio is over 1∶30),besides,the disturbance from the previous sampling durations upon the long-term monitoring values has been eliminated.To conclusion,this device is capable to discriminate radon and thoron accurately under distinctively different concentrations of radon and thoron.

关 键 词：ZnS闪烁室 连续监测 氡 钍射气 延迟计数法 甄别测量 

分 类 号：TL81[核科学技术—核技术及应用]