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A simple technique for measuring the activity size distribution of radon and thoron progeny aerosols.
Kranrod, Chutima; Chanyotha, Supitcha; Tokonami, Shinji; Ishikawa, Tetsuo.
Afiliação
  • Kranrod C; Natural Radiation Survey and Analysis Research Unit, Department of Nuclear Engineering, Faculty of Engineering, Chulalongkorn University, 10330, Bangkok, Thailand; Institute of Radiation Emergency Medicine, Hirosaki University, 0368564, Aomori, Japan.
  • Chanyotha S; Natural Radiation Survey and Analysis Research Unit, Department of Nuclear Engineering, Faculty of Engineering, Chulalongkorn University, 10330, Bangkok, Thailand. Electronic address: supitcha.c@chula.ac.th.
  • Tokonami S; Institute of Radiation Emergency Medicine, Hirosaki University, 0368564, Aomori, Japan.
  • Ishikawa T; Fukushima Medical University, Fukushima, 960-1247, Hikarigaoka, Japan.
J Environ Radioact ; 229-230: 106506, 2021 Apr.
Article em En | MEDLINE | ID: mdl-33472114
In this study, a portable cascade impactor was developed to more efficiently determine the activity size distribution of attached radon and thoron progeny in a natural environment. The developed impactor consisted of four stages with a backup filter stage for collection of the aerosol samples. The aerosol cut points were set for 10, 2.5, 1, and 0.5 µm at a sampling rate of 4 L min-1. Five CR-39 chips were used as alpha detectors for each stage. To separate the alpha particles emitted from radon and thoron progeny, the CR-39 detectors were covered with aluminium-vaporized Mylar films. The thickness of each film was adjusted to allow alpha particles emitted from radon and thoron progeny to reach the surface of the CR-39 detectors. The particle cut-off characteristics of each stage were determined by mono-dispersive aerosols with particle sizes ranging from 0.1 to 1.23 µm from the collection efficiency curve. The test results showed that the respective cut-off size of stages 3 and 4 were close to the designed cut-points. Validation of the technique by comparison with two commercial devices confirmed that the developed technique could provide the necessary information to estimate the activity size distribution of attached radon and thoron progeny for dose assessment, especially, in a field survey where direct electric power is not available.
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Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Monitoramento de Radiação / Radônio / Poluição do Ar em Ambientes Fechados / Poluentes Radioativos do Ar Idioma: En Revista: J Environ Radioact Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Japão

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Monitoramento de Radiação / Radônio / Poluição do Ar em Ambientes Fechados / Poluentes Radioativos do Ar Idioma: En Revista: J Environ Radioact Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Japão