Development of a continuous radon concentration monitoring system in underground soil

S. Yamamoto*, K. Tarutani, K. Yamasoto, D. Iskandar, T. Iida

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


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 languageEnglish
Pages (from-to)391-394
Number of pages4
JournalIEEE Transactions on Nuclear Science
Issue number3 I
Publication statusPublished - 2001 Jun
Externally publishedYes
Event2000 Nuclear Science Symphosium (NSS) - Lyon, France
Duration: 2000 Oct 152000 Oct 20


  • Continuous measurement
  • Radon
  • Real time
  • Underground soil

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Development of a continuous radon concentration monitoring system in underground soil'. Together they form a unique fingerprint.

Cite this