Results 1 - 10 of 1909
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[en] The radiation-resistant polymer developed by the Savannah River National Laboratory is adaptable for multiple applications to enhance polymer endurance and effectiveness in radiation environments. SRNL offers to collaborate with TEPCO in evaluation, testing, and utilization of SRNL's radiation-resistant polymer in the D&D of the Fukushima Daiichi NPS. Refinement of the scope and associated costs will be conducted in consultation with TECPO.
[en] Highlights: • We examined trends in exchangeable 137Cs in Fukushima forest soils for 6 years. • The proportion of 137Cs in exchangeable form decreased significantly for 2–4 years. • The proportion of exchangeable 137Cs was almost constant in the following years. - Abstract: We investigated the changes in 137Cs exchangeable fraction in the soils of contaminated forest ecosystems until 6 years after the Fukushima radioactive atmospheric deposits. For this investigation, we performed chemical extractions of 137Cs from both organic and mineral soil layer sampled from two forest stands, Japanese cedar (Cryptomeria japonica) and broadleaf deciduous, mainly konara oak (Quercus serrata), which are located 26–27 km inland from the Fukushima Dai-ichi Nuclear Power Plant. The exchangeable 137Cs as a proportion of the total 137Cs inventory was only 10% in the organic layer and 6.1% in the mineral soil layer about 5 months after the accident at the Japanese cedar site. We observed an exponential decrease in the proportion of exchangeable 137Cs in both organic and mineral soil layer samples over the 6-years observation period at both sites. The proportion significantly decreased within 2–4 years after the accident, becoming almost constant (2–4%). These results support the interpretation that contaminated forests have entered a steady-state phase of 137Cs cycling, although we need more integration for an improved vision of the future of Fukushima forests.
[en] The purpose of this study was to analyze the structural relationship between radiation hazards and radiation benefits effecting on overcoming recognition of Fukushima nuclear disaster (FND) in Japan by using structural equation modeling (SEM). The subjects were 248 undergraduates from one university in Chungbuk province in Korea. From June 1, 2017 to July 30, 2017, we conducted a questionnaire survey on the radiation hazards and radiation benefits and on the overcoming recognition of FND. As a result, it showed that the recognition of radiation hazards has a significant effect on the benefits of radiation, but does not directly affect the overcoming recognition of FND. However, the recognition of radiation benefits has been mediating between radiation hazards perception and the overcoming recognition of FND. Therefore, it can be empirically confirmed that despite the radiation hazards the recognition of overcoming the FND depends on the level of radiation benefits by using the SEM
[en] In order to assess the radioactive impact of Fukushima Incident on the coastal environment of Dapeng Peninsula, Shenzhen, China, combining accelerator mass spectrometry with epithermal neutron activation analysis, we measured the 129I/127I ratios and 129I levels in surface seawater, oyster (Ostrea gigas) and kelp (Sargassum henslouianum). The results showed that the influence of Daya Bay Nuclear Power Base was ignorable to local environment, but the Fukushima Incident had caused significant increase of 129I levels in oyster (P < 0.001) and kelp (P < 0.05) from Dapeng Peninsula between Jun-2011 and Apr-2012. However, the 129I levels in oyster and kelp were far below the guideline given by Codex Alimentarius Commission and would not cause immediate harm to the health of local residents. (author)
[en] The Tohoku earthquake, the Fukushima Daiichi Accident and its consequences has had a heavy influence on the environment surrounding the area of Fukushima. This talk will give a brief overview of the accident, will introduce shortly the different types of nuclear reactors and will show the differences to the Chernobyl accident. It will also discuss the efforts and steps taken to solve the groundwater problems, and will introduce the nuclide removal systems for water purification. It will be followed by a report of my visit to Fukushima Daiichi and the exclusion zone, which took place in February 2016. I will present measurements taken in the area and describe the ongoing decontamination work. (author)