In order to assess the radioactive impact of Daya Bay Nuclear Power Base on the environment of Daya Bay, Guangdong, we combined accelerator mass spectrometry (AMS) with epithermal neutron activation analysis (ENAA) and measured the level of long-lived radionuclide 129I in surface sea water, collected from Dapeng Peninsula area in the October of 2010. After the Fukushima incident in March of 2011, we collected surface sea water, oyster and kelp, i.e. Sargassum henslouianum, in June of 2011 and April of 2012 to assess the influence of the incident through bioindicators. According to results, 129I level showed no significant change in surface sea water caused by Fukushima incident or Daya Bay Power Plant, but rose significantly by 163% in oyster (p<0.001) and by 101% in kelp (p<0.05) from June of 2011 to April of 2012. This is likely due to bio-magnification from sea water to organisms. Because sea current along the east coast of Japan flows northeast, away from Guangdong area, atmospheric transmission should be the major channel for 129I from Fukushima. This conclusion concurs with the detections of 131I in Novosibirsk and Shanghai after the incident, respectively. According to the standard of Codex Alimentarius Commission, the 129I levels in kelp and oyster are far below the maximum accepted amount in diets, causing no harm to the health of local citizens, but considering the constant release of 129I at the accident site, long term monitor for radioactive nuclides along Guangdong coastal area is necessary and important. Besides, ENAA showed that average 127I level was 5.83�g/g in oyster and 461.11�g/g in kelp, with concentration coefficients at 217 and 17119, respectively, indicating that oyster and kelp possess high capability of iodine enrichment and are suitable bioindicators for 129I.

<sup>129</sup>I assessment on kelp, oyster, and sea water reveals the influence of Fukushima Incident and local nuclear power plant in Daya Bay, China

245th National Meeting (2013)

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129I assessment on kelp, oyster, and sea water reveals the influence of Fukushima Incident and local nuclear power plant in Daya Bay, China

¹²⁹I assessment on kelp, oyster, and sea water reveals the influence of Fukushima Incident and local nuclear power plant in Daya Bay, China