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目的掌握昌江核电站周围环境土壤放射性本底水平。方法依据《辐射环境监测技术规范》(HJ/T61-2001)布点,总α、总β参照《生活饮用水标准检验方法-放射性指标》(GB/T5750.13-2006)监测,放射性核素活度浓度按照《土壤中放射性核素的γ能谱分析方法》(GB11743-2013)监测。结果土壤总α、总β及238U、232Th、40K、226Ra、137Cs放射性活度浓度均数分别为(221.72±201.84)、(254.64±152.80)、(20.80±20.00)、(47.56±46.38)、(480.31±285.79)、(33.58±21.22)、(0.71±0.42)Bq/kg,雅加林场238U、232Th、40K、226Ra均最高;232Th对总的环境地表γ辐射剂量率贡献最大,占49.22%,估算值28.73 n Gy/h;距核电站不同距离中,40K放射性活度浓度最大,137Cs最小,除了137Cs外,其余放射性核素活度浓度及总α、总β50 km最高,5 km最低。结论昌江核电站环境土壤中226Ra、232Th、40K、238U、137Cs放射性水平在我国正常天然辐射本底水平内,与国内其它地区相比处于相对低的水平。
Objective To understand the radioactive background of soil around Changjiang Nuclear Power Station. Methods According to “Technical Specifications of Radiation Environment Monitoring” (HJ / T61-2001), the total α and total β were monitored with reference to “Standard Test Method for Domestic Drinking Water - Radioactive Index” (GB / T5750.13-2006) Degree of concentration in accordance with “radionuclide radionuclide gamma spectrometry method” (GB11743-2013) monitoring. Results The total radioactivity concentrations of soil total α, total β and 238U, 232Th, 40K, 226Ra and 137Cs were (221.72 ± 201.84), (254.64 ± 152.80), (20.80 ± 20.00) and (47.56 ± 46.38) 480T, 285K and 226Ra in Yajark forest farmland were the highest; 232Th had the largest contribution to the total environmental surface gamma radiation dose rate, accounting for 49.22% The estimated value is 28.73 n Gy / h. From the different distances of nuclear power plants, the highest concentration of 40K radioactivity and the smallest 137Cs are observed. The activity concentration of radionuclides except for 137Cs and the total α and total β50 km are the highest, and the lowest is 5 km. Conclusions The radioactive levels of 226Ra, 232Th, 40K, 238U and 137Cs in the soil of Changjiang NPP are within the normal natural radiation background of China and are at a relatively low level compared with other regions in the country.