|
| Ecological environment monitoring and risk assessment of radioactive element 137Cs in central fishing grounds of the North Pacific Ocean |
| Received:September 29, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:North Pacific high seas;central fishing grounds;nuclide;ecological environment monitoring;risk assessment |
| Author Name | Affiliation | | TANG Feng-hua | 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, Shanghai 200090, China
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | ZHANG Sheng-mao | 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, Shanghai 200090, China | | WU Zu-li | 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, Shanghai 200090, China | | CUI Xue-sen | 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, Shanghai 200090, China |
|
| Hits: 2066 |
| Download times: 2301 |
| Abstract: |
| Marine biological samples were taken in the central fishing grounds of the North Pacific high seas from 2011-2013, in order to understand the impact of Japan's Fukushima nuclear leakage on the high seas fisheries and develop the natural fishery industry in the North Pacific Ocean. The samples were dominated by neon flying squid(Ommastrephes bartramii). The result showed that radionuclide 137Cs was detected in all samples by a gamma ray spectrometer. Additionally, cross-check analysis was carried out among different species, organs and tissues. Analysis of the distribution of nuclides in marine organisms in the North Pacific Ocean and an assessment of their risk to fisheries were carried out. There were a large number of samples collected from 2011-2012. The specific activity of 137Cs was higher than the base in all samples. In 2011, the activity range of the 137Cs nuclides was 0.05~6.21 Bq·kg-1, while in 2012 it was 0.02~0.46 Bq·kg-1. In 2013, there were only two types of samples collected, and the range of activity was 0~0.37 Bq·kg-1. The quality activity of the nuclides in each nutrient-grade organism was normalized, and its average value was 0.49 Bq·kg-1 over three years. The average value in neon flying squid was 0.18 Bq·kg-1, while that in small fishes was 0.10 Bq·kg-1. The mass activity of nuclides showed an inverted pyramid distribution. The quality activity level of the nuclides during the three years of surveying did not exceed the concentration restriction of radionuclide quality in Chinese food, nor the standard line of general levels. At present, the risk assessment of radioactive element 137Cs shows that the quality activity of nuclides is in a relatively safe range, but also that follow-up monitoring is needed. |
|
|
|
