Radon concentration of outdoor air: Measured by an ionization chamber for radioisotope monitoring system at radioisotope institute

Yukari Tajika, Yumi Yasuoka, Hiroyuki Nagahama, Toshiyuki Suzuki, Yoshimi Homma, Tetsuo Ishikawa, Shinji Tokonami, Takahiro Mukai, Miroslaw Janik, Atsuyuki Sorimachi, Masahiro Hosoda

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Gas-flow ionization chambers for radioisotope (RI) monitoring systems at RI institutes throughout Japan are commonly used to measure RIs which leak from the RI institutes. Before the Japan's 2011 Tohoku earthquake [11 March 2011, moment magnitude (M w) 9.0], ionization current data measured with a gas-flow ionization chamber at the RI institute of Fukushima Medical University were found to change. The question we must raise is whether the variation ionization current can be considered to the variation of outdoor radon concentration. The conversion factors (from ionization current to radon concentration in air) of the gas-flow ionization chamber can be obtained by measuring four levels of radon concentration (outdoor air, indoor air, high level and radon-free gas) with an AlphaGUARD monitor and the chamber itself. The two gas-flow ionization chambers consist of the air intake and terminal exhaust duct of the RI institute. It was found that the radon concentration in the exhaust air was the same as that in the air intake. This study provided evidence that variations of outdoor radon concentration could be determined using gas-flow ionization chambers for RI monitoring systems.

Original languageEnglish
Pages (from-to)1709-1714
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume295
Issue number3
DOIs
Publication statusPublished - 2013 Mar 1

Keywords

  • Correction factor
  • Ionization chambers
  • Outdoor air
  • Radon concentration

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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