W区环境地表水中氚浓度水平调查与评价

Investigation and Assessment of on the Activity Concentration Level of Tritium in the Surface Water of W District

本课题主要研究W区相关水域地表水中氚活度浓度水平,并评估其对当地居民年有效剂量的贡献。考虑W区内的湖泊及河流分布,选取在B地区内以及周边入淀河流布设点位,分别于平水期、丰水期采集样品进行测量。结果:W区主要湖泊河流关键点位全年地表水平水期与丰水期氚活度浓度基本一致,均位于探测下限附近(探测下限LLD=0.91Bq/L),属正常本底水平,并且对周围生活居民造成的年有效剂量贡献十分有限。

This project mainly studied on the distribution of tritium activity concentration in the surface water of W District,and evaluated its contribution to the annual effect dose of local residents.Considering the distribution of lakes and rivers in the W District,points were selected to be located in the B distribution Lake and surrounding rivers.Samples were collected during the two seasons of the year.Results:The tritium activity concentration of the main lakes and rivers in W District are basically the same in the dry season(April)and the wet season(August).The activity concentration were located near the lower limit of detection line(LLD=0.91 Bq/L)which were in the normal background level of China.The concentrations of tritium in waters were lower than the national standard limits which will lead a little dose burden to local residents.