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| The Investigation of Activity Concentrations of Radionuclides in Foods in the Adjoining Areas of Haiyang Nuclear Power Plant |
| XU Jia-ang, LI Quan-tai, CHEN Ying-min, LI Hai-liang, BI Ming-wei |
| Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062 China |
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Abstract Objective The datas of the activity concentrations of the critical nuclides in foods of the adjoining areas of Haiyang Nuclear Power Plant were abtained before the operation,and the main goal of the investigation was to determine the background levels of the radionuclides distinguishing from those in the normal operation, nuclear accident and after the accident for evaluating or interpreting the radioactive impact to the foods. Methods The samples of the wheats,cabbages, fishes and milk of the adjoining areas of Haiyang Nuclear Power Plant were collected. The methods about preprocessing and preparation of the samples were based on Technical Criteria for Radiation Environmental Monitoring (HJ/T61-2001). The activity concentrations of the critical nuclides in foods were tested using HPGe-γ Energy Spectrum Measurement Systerm. Results The results showed that the average levels of 226Ra,232Th,137Cs and 40K in wheats were 7.4×10-2 Bq·kg-1,1.8×10-1 Bq ·kg-1,5.5×10-2 Bq·kg-1 and 8.2×101 Bq·kg-1 respectively, their range were from 2.7×10-2 Bq·kg-1 to 2.1×10-1 Bq·kg-1, from 1.1×10-1 Bq·kg-1 to 3.0×10-1 Bq·kg-1,from 1.9×10-2 Bq·kg-1 to 1.0×10-1 Bq·kg-1 and from 3.5×101 Bq·kg-1 to 1.2×102 Bq·kg-1 respectively. The average levels of 226Ra,137Cs and 40K in cabbages were 1.8×10-2 Bq·kg-1, 1.8×10-2 Bq·kg-1 and 5.0×101Bq·kg-1 respectively, their range were from 1.3×10-3 Bq·kg-1 to 2.7×10-2 Bq·kg-1, from 1.1×10-2 Bq·kg-1 to 3.3×10-2 Bq·kg-1 and from 4.0×101 Bq·kg-1 to 8.6×101 Bq· kg-1 respectively. The average levels of 226Ra,137Cs and 40K in fishes were 3.7×10-2 Bq·kg-1, 1.4×10-2 Bq·kg-1 and 2.1×101 Bq·kg-1 respectively. The average levels of 226Ra,137Cs and 40K in the milk was 1.2×10-2 Bq·kg-1, 1.8×10-2 Bq·kg-1 and 3.8×101 Bq·kg-1 respectively. The activity concentrations of the other radionuclides in foods were lower than the levels of the Minimum Detectable Activity Concentration respectively. Conclusions The activity concentrations of the artificial and natural radionuclides in foods of the adjoining areas within 30 km of Haiyang Nuclear Power Plant are about to the background levels. The committed equivalent doses of the residents suffered from the critical nuclides in foods are in the background levels.
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Received: 25 April 2011
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