氚污染不锈钢、铜、铝金属干法去污研究  

Study of Tritium Decontamination of Stainless Steel,Copper,Aluminum Metals by Tritium Dry Desorption

作　　者：谢云[1] 石正坤[1] 吴涛[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2014年第10期1746-1750,共5页Atomic Energy Science and Technology

基　　金：中国工程物理研究院核物理与化学研究所创新基金资助项目(2011CX04)

摘　　要：为了考察氚污染金属干法去污的去污效率,对氚污染不锈钢、铜和铝进行了紫外线、臭氧、加热及联合(紫外线、臭氧与加热)去污实验研究。研究结果表明:紫外线单独照射去污效率较差,加热可明显提高去污效率,500℃联合172nm的紫外线去污4h对不锈钢表面氚去污率可达99.2%;臭氧对铜有较好的去污效率,臭氧与加热(500℃)的组合对不锈钢、铝、铜的去污率均高于99.2%;高温(500℃)较低温(300℃)去污效率高;氚去污后金属放置30d表面氚有所增加,主要是氚的扩散和渗透所致;氚污染不锈钢存在4种氚吸附态。In order to study the decontamination efficiency of stainless steel ,copper , aluminum metals contaminated by tritium ,the metals were decontaminated by exposing to UV ,ozone ,heating ,and the combination of heating ,UV and ozone .The result indicates that the elevation of temperature can obviously improve decontamination . While irradiated by 172 nm UV ,the decontamination efficiency is low ,but it is better while heated and irradiated by 172 nm UV .If the stainless steel is irradiated by 172 nm UV and heated at 500 ℃ for 4 h ,the decontamination efficiency is 99.2% .There is better decontamination efficiency of copper while exposed to ozone .While exposed to ozone and heated at 500 ℃ ,the decontamination efficiencies of stainless steel ,copper and aluminum are higher than 99.2% . T he decontamination efficiency can more obviously improve w hen metal is heated at high temperature （500 ℃ ） than low temperature （300 ℃） .The surface tritium of metal placed at 30 d after decontamination increases because of diffusion and penetration of the tritium . Resolution spectra of tritium show that there are four kinds of contamination adsorbed tritium of stainless steel .

关 键 词：氚 去污 紫外线 臭氧 加热 

分 类 号：O434[机械工程—光学工程]