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In-situ detection of high-energy beta ray emitter $$^{90}$$Sr/$$^{90}$$Y inside the Fukushima Daiichi Nuclear Power Station Unit 3 reactor building using a liquid light guide Cherenkov counter

寺阪 祐太   ; 佐藤 優樹  ; 古田 禄大*; 久保 信*; 一場 雄太*

Terasaka, Yuta; Sato, Yuki; Furuta, Yoshihiro*; Kubo, Shin*; Ichiba, Yuta*

We have developed a method to directly detect $$^{90}$$Sr/$$^{90}$$Y under a high gamma ray background using a liquid light guide Cherenkov counter. Cherenkov radiation has the characteristic that the angle of radiation varies depending on the energy of the charged particles. Using this feature, we have developed a surface contamination detector capable of discriminating between 662 keV gamma rays from $$^{137}$$Cs and beta rays from $$^{90}$$Sr/$$^{90}$$Y through time-of-flight analysis of the Cherenkov radiation generated inside the liquid light guide. With this detector, we conducted a measurement test of $$^{90}$$Sr/$$^{90}$$Y inside the Fukushima Daiichi Nuclear Power Station Unit 3 reactor building and achieved the first in-situ detection of $$^{90}$$Sr/$$^{90}$$Y under a high gamma-ray background.

使用言語

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English

掲載資料名

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Nuclear Instruments and Methods in Physics Research A

巻

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1070

号

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2

ページ数

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p.170021_1 - 170021_9

発行年月

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2025/01

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident; Fukushima Daiichi Nuclear Power Station; Strontium-90; Liquid light guide; Cherenkov photon; Time-of-flight

特許データ

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PDF

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論文URL

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https://doi.org/10.1016/j.nima.2024.170021

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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東京電力ホールディングス

Access

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- Accesses

InCites™

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Altmetrics

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