In situ measurement of 134Cs and 137Cs in seabed using underwater γ-spectrometry systems: application in surveys following the Fukushima Dai-ichi Nuclear Power Plant accident

Two underwater γ-spectrometric systems incorporating NaI(Tl) detectors (the seabed mooring system and the towing system) were used to measure radiocesium in seabed that was released due to the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident and assess the accuracy of in situ measurements on...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2015-02, Vol.303 (2), p.1575-1579
Main Author: Kofuji, Hisaki
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
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Summary:Two underwater γ-spectrometric systems incorporating NaI(Tl) detectors (the seabed mooring system and the towing system) were used to measure radiocesium in seabed that was released due to the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident and assess the accuracy of in situ measurements on seabed. We also applied a simple calculating method for seabed radiocesium by separating the γ-spectra based on four contributions ( 134 Cs +  137 Cs, 40 K, U-series, and Th-series radionuclides). The concentration of 134 Cs +  137 Cs in sediments at two sites in Sendai Bay were calculated to be between 10–250 Bq/kg-dry through our method with a short integration time (1–5 min).
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-014-3702-0