摘要
目的 调查浙江省余杭区和三门县居室内222Rn、220Rn及其子体水平,明确其所致公众有效剂量.方法 采用固体径迹探测器测量余杭区和三门县两地居室中222Rn和220Rn浓度,探测器均放置于卧室或客厅,在不改变居民日常通风习惯情况下连续暴露6个月.结果 不同房屋类型室内222Rn和220Rn测定,均显示平房室内氡浓度最高.室内222Rn浓度与不同建筑年代无关（F=0.53,P＞0.05）,而室内220Rn浓度与不同建筑年代有相关性（F=3.56,P＜0.05）.室内220Rn浓度未装修居室高于装修居室（t=2.33,P＜0.05）.余杭区调查的居室内平均222Rn浓度为32.5 Bq/m3,220Rn为314.3 Bq/m3,所致有效剂量分别为0.88和0.42 mSv;三门县调查的居室内平均222Rn浓度为26.8 Bq/m3,220Rn为399.5 Bq/m3,有效剂量分别为0.72和0.53 mSv.结论 浙江余杭和三门室内222Rn浓度属正常天然本底水平,两地农村居室内220Rn浓度较高,220Rn及其子体的剂量贡献超过了222Rn及其子体引起的年有效剂量的50%.
Objective To investigate the concentrations of indoor radon （222Rn） and its daughter products as well as indoor thoron （220Rn） in selected houses in Yuhang district and Sanmen county,Zhejiang province,and estimate their annual effective doses to the population.Methods Solid state nuclear track detectors were used in selected dwellings in Yuhang district and Sanmen county,and the detectors were placed in bedrooms or living rooms.Without changing the ventilation habits of residents,These detectors were continuously placed from March to September in 2009.Results Indoor 222 Rn and 220Rn concentrations in low-rise buildings were the highest among all types of houses.The indoor concentration of 222 Rn had no relation with the building age （F = 0.53,P ＞ 0.05）,but that of 220 Rn was dependent on the building age （F = 3.56,P ＜ 0.05）.Moreover,the investigation demonstrated indoor 220 Rn concentrations in houses with no decoration were higher than in the houses decorated （t = 2.33,P ＜0.05）.The average indoor concentrations of 222Rn and 220Rn in Yuhang district were 32.5 Bq/m3 and 314.3 Bq/m3,respectively,and the annual effective doses were 0.88 mSy and 0.42 mSv respectively.The average indoor concentrations of 222Rn and 220Rn in Sanmen county were 26.8 Bq/m3 and 399.5 Bq/m3,and the annual effective doses were 0.72 mSy and 0.53 mSv respectively.Conclusion The concentrations of indoor 222 Rn in some areas of Zhejiang province are at natural background level,and the concentrations of indoor 220Rn in rural areas are relatively higher.The total annual effective dose from 220Rn and its progeny was larger than that from 222Rn and its progeny by 50 percents.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2010年第5期599-603,共5页
Chinese Journal of Radiological Medicine and Protection
基金
国家自然科学基金（10675105）
