Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 391-394 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 48 |
| Issue number | 3 I |
| DOIs | |
| Publication status | Published - 2001 Jun |
| Externally published | Yes |
| Event | 2000 Nuclear Science Symphosium (NSS) - Lyon, France Duration: 2000 Oct 15 → 2000 Oct 20 |
Keywords
- Continuous measurement
- Radon
- Real time
- Underground soil
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering