Development of a continuous radon concentration monitoring system in underground soil

被引:9
|
作者
Yamamoto, S [1 ]
Tarutani, K
Yamasoto, K
Iskandar, D
Iida, T
机构
[1] Kobe City Coll Technol, Kobe, Hyogo, Japan
[2] Nagoya Univ, Nagoya, Aichi, Japan
关键词
continuous measurement; radon; real time; underground soil;
D O I
10.1109/23.940086
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A continuous radon (Rn-222) concentration monitoring system for use in underground soil was developed and tested. The system consists of a 19-mm-diameter, 1100-mm-long detector assembly and a microprocessor based data logger. A small volume chamber is installed at the tip of the detector assembly. A thin ZnS(Ag) scintillator film inside the chamber and a photomultiplier tube (PMT) detect alpha particles from radon and its daughters. When the system is in measurement, the detector part is buried into underground soil. An energy resolution of approximately 70 % full width half maximum (FWHM) was obtained for 5.5 MeV alpha particles from Am-241. Both the rise time and fall time for the system were measured to be approximately 1-2 h. Temporal variations in underground radon concentration at different depths were investigated simultaneously using four sets of the developed system. The results confirmed that the developed system is useful for continuous measurement of radon concentration in underground soil.
引用
收藏
页码:391 / 394
页数:4
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