Kotrappa P, Dempsey J C, Ramsey R W, Stieff L R
Rad Elec Inc., Frederick, MD 21701.
Health Phys. 1990 Apr;58(4):461-7. doi: 10.1097/00004032-199004000-00008.
The technical and scientific basis for the measurement of indoor 222Rn concentration using an E-PERM (Electret passive environmental radon monitor) has been described in our earlier work. The purpose of this paper is to describe further development of a practical and convenient system that can be used routinely for indoor 222Rn measurement. The ion chamber is now made of electrically conducting plastic to minimize the response from natural gamma radiation. A spring-loaded shutter method is used to cover and uncover the electret from outside the chamber. The electret voltage reader has been modified to improve the accuracy and the ease in operation. The calibration, performance, error analysis, and lower limits of detection for these standardized versions of E-PERMs are also described.
我们之前的工作中已阐述了使用驻极体被动式环境氡监测仪（E-PERM）测量室内222Rn浓度的技术和科学依据。本文旨在描述一种实用便捷系统的进一步发展，该系统可常规用于室内222Rn测量。现在离子室由导电塑料制成，以尽量减少天然伽马辐射的响应。采用弹簧加载快门方法从室外覆盖和露出驻极体。驻极体电压读取器已进行改进，以提高准确性和操作便利性。还描述了这些标准化版本E-PERM的校准、性能、误差分析和检测下限。
