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Report No.
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Development of "in-situ" alpha-ray dust monitors for fuel debris dismantling and decommissioning

Tsubota, Yoichi   ; Honda, Fumiya; Tokonami, Shinji*; Tamakuma, Yuki*; Nakagawa, Takahiro ; Ikeda, Atsushi  

Aerosol behavior differs greatly depending on the generation history and processing method of NFDs. Especially for aerosols containing alpha ray emitting nuclides (alpha aerosols), which have a large internal dose upon inhalation, confinement and monitoring in the PCV are important. JAEA has been developing instruments to measure alpha aerosols in the 1F-PCV. The In-situ Alpha Air Monitor (IAAM), which was designed and developed to measure alpha aerosols "in-situ" in the harsh environment of the 1F-PCV, operates in a high-humidity, high gamma ray environment and can measure alpha aerosol concentrations 30 times The IAAM operates in a high humidity, high gamma ray environment and has demonstrated alpha aerosol measurement performance of more than 30 times the expected concentration in the 1F-PCV.

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