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Terasaka, Yuta; Watanabe, Kenichi*; Uritani, Akira*
Nuclear Instruments and Methods in Physics Research A, 996, p.165151_1 - 165151_8, 2021/04
Times Cited Count：3 Percentile：46.8(Instruments & Instrumentation)For the measurement of radiation distribution inside the Fukushima Daiichi Nuclear Power Station (FDNPS) buildings, the evaluation of a small-diameter quartz optical fiber as a one-dimensional position-sensitive sensor was conducted. The sensor determines the incident position of radiation into the fiber using the time-of-flight information of emitted Cerenkov photons in the optical fiber. Compared with the conventional sensor using the plastic scintillating fiber, the quartz optical fiber has much higher position resolution, which may be the result of the improvement of timing characteristics caused by the prompt emission mechanism of the Cerenkov radiation. Additionally, the response of position-sensitive quartz optical fiber sensor under high radiation field was evaluated, and good count rate linearity was confirmed using the 10 m long quartz optical fiber with a diameter of 0.4 mm up to the dose rate at least 20 mSv/h, and the radiation tolerance property up to the accumulated dose of 1 kGy was evaluated.
Yamamoto, Keiichi; Takeuchi, Tomoaki; Hayashi, Takayasu*; Kosuge, Fumiaki*; Tsuchiya, Kunihiko
JAEA-Testing 2016-002, 25 Pages, 2016/11
JAEA-Testing-2016-002.pdf:4.97MB
Development of the reactor measurement system has been carried out to obtain the real-time in-core nuclear and thermal information, where the quantitative measurement of brightness of Cherenkov light was investigated. The system would be applied as a monitoring system in severe accidents and for the advanced operation management technology in existing LWRs. This report summarized the modification of Cherenkov light estimation system described JAEA-Testing 2015-001 and the result of the burn-up evaluation by Cherenkov light image emitted from spent fuel elements of LWRs with the modified system.
Yamamoto, Keiichi; Takeuchi, Tomoaki; Hayashi, Takayasu*; Kosuge, Fumiaki*; Sano, Tadafumi*; Tsuchiya, Kunihiko
JAEA-Testing 2015-001, 25 Pages, 2015/11
JAEA-Testing-2015-001.pdf:3.52MB
Development of the reactor measurement system was started to obtain the real-time in-core nuclear and thermal information, where the quantitative measurement of brightness of Cherenkov light was investigated. This report was summarized the results of design and trial fabrication of the Cherenkov light estimation system from thermal power evaluation from Cherenkov light image emitted from the fuel elements. The developed Cherenkov light estimation system was verified with the Cherenkov light image emitted from the fuels in the core of Kyoto University Research Reactor (KUR). From the results, it is necessary to improve the observation method of Cherenkov light in the reactor and the evaluation method of the brightness of Cherenkov light. In future, the system will be applied for the evaluation of burn-up of spent fuels from the Cherenkov light emitted from the spent fuel assemblies in LWRs.
Yamamoto, Keiichi; Takeuchi, Tomoaki; Sano, Tadafumi*; Homma, Ryohei*; Kimura, Nobuaki; Otsuka, Noriaki; Kosuge, Fumiaki*; Nakajima, Ken*; Tsuchiya, Kunihiko
JAEA-Technology 2014-028, 56 Pages, 2015/01
JAEA-Technology-2014-028.pdf:9.23MB
Development of the reactor measurement system was started to obtain real-time in-core nuclear and thermal information, where the quantity measurement of brightness of Cherenkov light was applied. The system would be applied as monitoring system in severe accidents and for advanced operation management technology in existing LWRs. In this report, the calculation and the observation results were summarized about the quantity of the Cherenkov light caused by the 
and 
ray emitted from the fuels in the core of Kyoto University Research Reactor.
Re by Cherenkov countingKushita, Kohei; J.Du*
Applied Radiation and Isotopes, 49(9-11), p.1069 - 1072, 1998/00
Times Cited Count：3 Percentile：31.85(Chemistry, Inorganic & Nuclear)no abstracts in English
-raysRadioisotopes, 24(10), p.71 - 77, 1975/10
no abstracts in English
Komeda, Masao; Ozu, Akira; Toh, Yosuke
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Komeda, Masao; Ozu, Akira; Toh, Yosuke
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Komeda, Masao; Toh, Yosuke; Tanabe, Kosuke*
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no abstracts in English
Terasaka, Yuta; Watanabe, Kenichi*; Uritani, Akira*
no journal, ,
no abstracts in English
Komeda, Masao; Toh, Yosuke; Tanabe, Kosuke*
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no abstracts in English
Komeda, Masao; Toh, Yosuke; Tanabe, Kosuke*
no journal, ,
no abstracts in English
Sr/Y and 
Cs using a liquid light guide Cerenkov counterTerasaka, Yuta; Uritani, Akira*
no journal, ,
no abstracts in English
Komeda, Masao; Toh, Yosuke; Tanabe, Kosuke*
no journal, ,
no abstracts in English
Sr/Y in high gamma radiation backgrounds utilizing Cherenkov radiation directivityTerasaka, Yuta; Sato, Yuki; Furuta, Yoshihiro*; Kubo, Shin*
no journal, ,
no abstracts in English
