Remote in-situ detection of alpha and beta emitters inside the Fukushima Daiichi Nuclear Power Station Unit 3 reactor building using phoswich and Cherenkov detectors

Terasaka, Yuta ; Sato, Yuki ; Morishita, Yuki ; Ichiba, Yuta*

A remote radiation detection system was developed by combining a phoswich detector for alpha/beta discrimination and a Cherenkov detector designed to selectively respond to high-energy beta particles from $^{90}$ Sr/ $^{90}$ Y. The system was mounted on a cart connected to a mecanum-wheel robot and deployed inside the Fukushima Daiichi Nuclear Power Station Unit 3 reactor building. Both alpha and beta measurements were conducted at multiple locations. The obtained data suggest the potential detection of $^{90}$ Sr/ $^{90}$ Y under high gamma background conditions. Integration of the radiation data with 3D point cloud models acquired by LiDAR is also in progress, aiming to enable spatial visualization of alpha and beta contamination inside the reactor building.

Language	:	English
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Meeting title	:	2025 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference (2025 IEEE NSS MIC RTSD)
Held date	:	2025/11
Location (city)	:	Yokohama
Location (country)	:	Japan
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Keywords	:	Fukushima Daiichi Nuclear Power Station Accident; 福島第一原子力発電所事故; Phoswich detector; Fukushima Daiichi Nuclear Power Station.; Cherenkov detector; alpha particle; $^{90}$ Sr/ $^{90}$ Y; in-situ measurement
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Cooperating Institute	:	東京電力HD

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Registration No. : BB20250157
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