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| Analysis of radioactivity level of main seafood in a sea area offshore Beibu Gulf |
| ZHAO Xinchun, FENG Lanying, WU Yingyu, LU Xiufang, XIE Ping |
| Institute of Radiation Health and Protection, Guangxi Zhuang Autonomous Region Center for Disease Control and Prevention, Nanning 530028 China |
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Abstract Objective To investigate the radioactivity level of main seafood in the offshore area near the Beibu Gulf.Method High purity germanium (HP-GE) γ spectrometer was used to detect and analyze the collected seafood.Results 226Ra and 40K could be detected in all the 10 samples and the detection ranges were (0.069～4.95) Bq/kg and (34.0～114.9) Bq/kg, respectively. 238U could was detected in four samples, and the detection range was (0.142～0.660) Bq/kg. 137Cs could be detected in seven samples and the detection range was (0.012～0.078) Bq/kg. The detection range of 232Th in the other 9 samples was (0.206～9.81) Bq/kg, except for one sample with abnormal result.Conclusion The radioactivity levels of 238U and 137Cs in seafood in this area were all within the range of the national investigation level. The radioactivity level of 226Ra in two kinds of seafood was higher than that in the national survey. The radioactivity level of 232Th in five kinds of seafood was significantly higher than that in the national survey. The specific activity of 232Th in one sample of balang fish was 23.2 Bq/kg (5.71 mg/kg), which exceeded the national standard limit (3.6 mg/kg). The detection results of natural radionuclides in the seabed sediment and sea water in the sampling area were all within the range of the literature, and the radioactivity levels of artificial radionuclides were all lower than the detection limit of the instrument. The reason for the abnormal radioactivity level of balang fish samples is unknown, and further investigation and long-term monitoring of radioactivity of seafood in this area are needed.
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Received: 06 April 2021
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