Development of a self-powered gamma detector

A type of self-powered gamma detector (SPGD) of only a few millimeters in diameter was developed as an alternative to direct visual contact to assess the position and situation of the fuel debris inside the primary containment vessel (PCV) of the Fukushima Daiichi Nuclear Power Station. Gamma irradi...

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Bibliographic Details
Published inJournal of nuclear science and technology Vol. 51; no. 7-8; pp. 939 - 943
Main Authors Takeuchi, Tomoaki, Ohtsuka, Noriaki, Shibata, Akira, Tsuchiya, Kunihiko
Format Journal Article
LanguageEnglish
Published Taylor & Francis 03.08.2014
Subjects
decommission
emitter
Fukushima Daiichi Nuclear Power Station
gamma detector
lead
self-powered
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Summary:A type of self-powered gamma detector (SPGD) of only a few millimeters in diameter was developed as an alternative to direct visual contact to assess the position and situation of the fuel debris inside the primary containment vessel (PCV) of the Fukushima Daiichi Nuclear Power Station. Gamma irradiation experiments with a 60 Co source were carried out, and the output signals of the SPGD were proportional to the gamma dose rate in the range from about 10 to 5000 Gy/h. The lower detection limits of the SPGD were judged to be sufficiently less than the expected dose rate inside the station's Unit 2 PCV.
ISSN:0022-3131
1881-1248
DOI:10.1080/00223131.2014.907549