Indoor 222Rn measurements using an activated charcoal detector

Yuko Murase, Yoshio Homma, Isao Murakami, Keiko Handa, Horiuchi Kimiko Horiuchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A commercially available activated charcoal detector for measuring 222Rn activity concentrations in air was calibrated with known amounts of 222Rn and examined in terms of air luminescence counts and interferences from 220Rn and 219Rn. The results for conditions normally encountered indoor indicate that the detector is simple and reliable. The method has been applied to assay indoor 222Rn activity concentrations in 387 homes in Tokyo and the adjacent four prefectures, which ranged from 0.7 to 140Bq/m3 and averaged 22.7 Bq/m3.

Original languageEnglish
Pages (from-to)561-565
Number of pages5
JournalApplied Radiation and Isotopes
Issue number3
Publication statusPublished - 1999 Mar

ASJC Scopus subject areas

  • Radiation


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