Analysis of radioactivity monitoring results of atmospheric fallout in the area around Daya Bay Nuclear Power Plant, 2019-2022
10.13491/j.issn.1004-714X.2025.03.002
- VernacularTitle:大亚湾核电站周边地区2019—2022年大气沉降物放射性监测结果分析
- Author:
Haijun WANG
1
;
Kun ZHAO
1
;
Jingan LUO
1
;
Xiaoqiang WANG
1
;
Yongqin LIN
1
;
Jinmin CAI
1
Author Information
1. Shenzhen Prevention and Treatment Center for Occupational Diseases, Shenzhen 518020, China.
- Publication Type:OriginalArticles
- Keywords:
Daya Bay Nuclear Power Plant;
Atmospheric fallout;
Gross α;
Gross β;
Radionuclide
- From:
Chinese Journal of Radiological Health
2025;34(3):318-323
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the activity concentrations of gross α, gross β, and radionuclides in atmospheric fallout around Daya Bay Nuclear Power Plant from 2019 to 2022, and provide foundational scientific data for the healthy development of nuclear energy. Methods Five monitoring sites were set up at different distances (1.2, 6.9, 12.4, 42.3, and 69.2 km) from Daya Bay Nuclear Island 1. Stainless steel sampling barrels were used to collect atmospheric fallout, with a monitoring cycle of three months. The collected samples were ashed using radiochemical method. Subsequently, the gross α and gross β radioactivity were quantified using a low-background α/β measurement instrument. The remaining ash samples were mixed with water and left to equilibrate for over three weeks before γ-nuclide analysis using a low-background, high-purity germanium γ-spectrometer. Results The gross α activity concentration in atmospheric fallout around Daya Bay Nuclear Power Plant from 2019 to 2022 averaged (25.3 ± 10.6) Bq/m2/season and ranged from 5.8 to 73.4 Bq/m2/season. The gross α activity concentrations in sampling sites #1 to #5 were 5.8-34.4, 11.9-35.2, 14.4-46.4, 7.2-73.4, and 13.1-43.1 Bq/m2/season, respectively. The gross β activity concentration averaged (50.5 ± 23.4) Bq/m2/season and ranged from 13.9 to 139.3 Bq/m2/season. The gross β activity concentrations of sampling sites #1 to #5 were 17.1-107.4, 17.6-87.5, 25.8-102.0, 13.9-139.3, and 23.4-99.2 Bq/m2/season, resprctively. The activity concentrations of 238U, 226Ra, 232Th, 40K, 210Pb, and 7Be in atmospheric fallout were < lower limit of detection (LLD)-4.2, < LLD-5.8, < LLD-6.3, < LLD-42.1, < LLD-514.0, and 35.7-1761.0 Bq/m2/season, respectively. Gross α and gross β activity concentrations were significantly positively correlated with 210Pb activity concentration (r=0.770, α < 0.001; r=0.882, α < 0.001, respectively). Gross β activity concentration showed a significant positive correlation with 7Be (r=0.833, α < 0.001). The activity concentrations of 54Mn, 57Co, 58Co, 60Co, 59Fe, 95Zr, 103Ru, 106Ru, 110mAg, 131I, 134Cs, 137 Cs, 140Ba and 192Ir were lower than the LLD of the instrument, and no artificial radionuclides were detected. Conclusion The gross α and gross β radioactive activity concentrations in the atmospheric fallout in the surrounding area of Daya Bay Nuclear Power Plant during 2019-2022 were affected by natural radionuclides 210Pb and 7Be, and were in the normal fluctuation ranges. No artificial radionuclides were found in the atmospheric fallout, and the Daya Bay Nuclear Power Plant was in a safe and stable state of operation.
