Authors:
Fenghua Tang
and
Xuesen Cui
Affiliation:
Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, East China Sea fisheries Research Institute,Chinese Academy of Fishery Sciences and Shanghai, China
Keyword(s):
North Pacific high seas, radionuclide, neon flying squid, risk assessment
Abstract:
Typical biological samples were analysed in central fishing grounds in North Pacific high seas for three consecutive years from 2011-2013, to understand the impact of Japan's Fukushima nuclear leakage on the high seas fishery, in order to develop the natural fishery resources of the north Pacific Ocean. The sample was dominated by Neon flying squid. It was found that all samples contained radionuclide Cs-137 by a gamma ray spectrometer and cross-check analysis was carried out among different species, organs and tissues. The distribution of nuclide in Marine organisms in the northern Pacific Ocean and its risk assessment were carried out. There were a large number of samples collected from 2011 to 2012. A Cs‐137 specific activity higher than the base one was detected for the entire sample. In 2011, the nuclide was 0.05 to 6.21 Bq•kg-1, compared with the activity range of 0.02 to 0.46 Bq•kg-1 in 2012. In 2013, there were only two types of samples collected, and the range of activity wa
s the base value to 0.37 Bq•kg-1. The quality activity of the nuclides of each nutrient-grade organism was averaged, and the average of the three years was 0.49 Bq•kg-1. The mass activity of nuclide has inverted pyramid distribution. The quality activity level of the nuclide during the three years' survey did not exceed the concentration of radionuclide quality in Chinese food and the standard line of general level. At present, the risk assessment of radioactive element Cs-137 showed that the quality activity of nuclide was in a relatively safe range, but the follow-up monitoring was needed.
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