Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 114, Issue -, Pages 35-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2011.12.016
Keywords
Fukushima accident; Activity concentrations in air; Isotope ratios; Estimate of burn-up and decay time; Fuel inventory calculations
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It is shown which information can be extracted from the monitoring of radionuclides emitted from the Fukushima Dai-ichi nuclear power plant and transported to Europe. In this part the focus will be on the analysis of the concentration ratios. While I-131, Cs-134 and Cs-137 were reported by most stations, other detected radionuclides, reported by some, are Nb-95, Te-129m, Te-132, I-132, (CS)-C-136 and La-140. From their activity ratios a mean burn-up of 26.7 GWd/t of the fuel from which they originated is estimated. Based on these data, inventories of radionuclides present at the time of the accident are calculated. The caesium activity ratios indicate emissions from the core of unit 4 which had been unloaded into the fuel storage pool prior to the accident. (C) 2011 Elsevier Ltd. All rights reserved.
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