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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

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.

Language

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English

Journal

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Nuclear Instruments and Methods in Physics Research A

Volume

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1070, Part 2

Number

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Pages

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p.170021_1 - 170021_9

Publication Year/Month

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2025/01

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Patent information

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Paper URL

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

DOI for research data

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Link to research data related to this paper/report.

Keywords

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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

Research Facility

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Press Release

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JAEA R&D Navigator

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Measuring Radioactive Strontium in High Gamma Ray Environments Using Cherenkov Emission in a Liquid Optical Fiber; In-Situ Direct Detection of Radioactive Strontium Inside the Fukushima Daiichi Nuclear Power Station Unit 3 Reactor Building[]

Cooperating Institute

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東京電力ホールディングス

Accesses

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- Accesses

InCites™

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Percentile:42.78

Category:Instruments & Instrumentation

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