کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8082956 1521596 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Delivery mechanism of 134Cs and 137Cs in seawater off the Sanriku Coast, Japan, following the Fukushima Dai-ichi NPP accident
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Delivery mechanism of 134Cs and 137Cs in seawater off the Sanriku Coast, Japan, following the Fukushima Dai-ichi NPP accident
چکیده انگلیسی
To assess the delivery mechanism of radiocesium emitted from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP), we examined vertical profiles of 134Cs, 137Cs, and 228Ra concentrations and the 228Ra/226Ra ratio in the water columns off the Sanriku Coast in the northwestern Pacific Ocean, in July 2012, along with their surface lateral variations in July 2009. Radiocesium concentrations exhibited maximum peaks (3-5 mBq/L for 134Cs) at depths of 100-200 m, accompanied by high 228Ra concentrations (0.6-0.8 mBq/L) in comparison with shallower depths (∼0.4 mBq/L). Taking the circulation patterns of currents in the area into account, it was inferred that radioactive depositions were supplied to the 228Ra-rich Tsugaru Warm Current Water (TWCW) in the offshore area of the Sanriku Coast following the FDNPP accident, and that after the spring of 2011, this water (∼26.5σθ) was covered by lower density surface water, which helped intrude its way to depths of 100-200 m.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 137, November 2014, Pages 113-118
نویسندگان
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