稀土湿法生产过程中放射性核素的迁移及对公众所致辐射剂量研究  

Study on Radio-nuclides Transfer and Radiation Doses of the Public in Some Rare-earth Mine Wet Refining Processes

作　　者：帅震清[1] 朱世富[1] 赵北君[1] 

机构地区：[1]四川大学,成都610064

出　　处：《核动力工程》2003年第6期593-596,共4页Nuclear Power Engineering

基　　金：国家自然科学研究基金资助项目(10175047)

摘　　要：描述了稀土矿湿法生产过程中放射性核素的迁移规律,并对四川省冕宁稀土矿湿法分离工艺进行分析研究。结果表明,稀土湿法冶炼过程中大部分放射性钍富集在废渣和产品中,仅有1.03%的钍粉尘排入大气,0.27%的放射性钍进入废水。对排入环境中的气载和液载放射性钍的辐射剂量进行了计算,其结果分别为6.02×10-2 mSv·a-1、1.43×10-2 mSv·a-1,该值低于公众个人剂量基本限值(1mSv·a-1),工作人员个人最大有效剂量为7.67×10-2This paper describes the transfer rule of radio-nuclides in rare-earth mine wet refining factories, and analyzes the wet refining process used for the rare-earth mine of Mianning county in Sichuan province. The results show that the radio-nuclides in sold wastes and productsmainly consist of radiological Thorium, both in waste air and water, 1.03% and 0.27%, respectively. Radiation doses of th0e public caused atmospheric releases of Thorium and liquid releases of Thorium were calculated. The maximum annual individual effective dose equivalence to the public around are respectively 6.02?0-2 mSv a-1 and 1.43 ?0-2 mSv·a-1 , which are below the public dose limit (1 mSv·a-1). Maximum annual individual effective dose equivalence to the occupational worker in the workshop is 7.67 mSv·a-1 . This value is lower than 50 mSv·a-1 , the occupational worker dose limit.

关 键 词：稀土分离 核素迁移 辐射剂量 

分 类 号：O615.2[理学—无机化学]