一种内源式^(220)Rn室的研制  

Development of A ^(220)Rn Chamber with Inner Sources

作　　者：唐方东[1] 赵超[2] 卓维海[2] 何林锋[1] 陈波[2] 张辉[2] 

机构地区：[1]上海市计量测试技术研究院,上海201203 [2]复旦大学放射医学研究所,上海200032

出　　处：《中国辐射卫生》2011年第3期273-274,共2页Chinese Journal of Radiological Health

基　　金：国家质检总局科技计划项目(2009QK099)

摘　　要：目的为开展各种220Rn浓度测量仪器的校准,研制220Rn室。方法基于程控式恒温恒湿实验箱,设计温度和湿度可控的内源式220Rn室;利用树脂吸附法制备颗粒状220Rn源,合理设置220Rn源并借助四个内置风扇的风速调节以实现220Rn浓度的均匀分布。结果在同一温度和湿度条件下,220Rn室内220Rn浓度变化范围小于±3.0%,且在有效体积范围内(约200 L),220Rn浓度分布基本均匀(波动范围小于±5.5%);220Rn室内222Rn浓度可忽略不计。结论该220Rn室内220Rn浓度稳定且分布均匀,可用来开展220Rn浓度测量仪器的校正或比对实验。Objective To develop a ^220Rn chamber for calibrations of ^220Rn measurement device. Methods Based on a programmable constant temperature and humidity testing device, a ^220Rn chamber with inner sources was designed. The granular ^220Rn sources were prepared by using the adsorption method of resins. In order to produce a uniform distribution of ^220Rn in the chamber, four minielectric fans were used to adjust the wind directions and speeds in the chamber in addition to a reasonable setting of the sources. Results Under the same temperature and humidity conditions, ^220Rn concentrations in the chamber fluctuated within only ＋ 3%, and the spatial distribution of ^220Rn was nearly homogenous in an effective volume of about 200 L. ^220Rn concentrations in the chamber could be neglected. Conclusion ^220Rn concentrations in the chamber are stable and uniform, the chamber can be used for calibration or intercomparison experiments of ^220Rn measurements.

关 键 词：^220Rn室 稳定性 均匀性 校准 

分 类 号：TL811[核科学技术—核技术及应用]