摘要
目的研究贫铀 (DU)模拟撞击产生气溶胶的理化特性。方法将DU撞击燃烧 ,采样后分析气溶胶分散度、化学成分和核素组成 ,气溶胶在模拟肺液中的溶解度 ,以及气溶胶浓度的时间变化和空间分布。结果 DU气溶胶浓度在 10min内降低到 1 30。DU燃烧烟雾MMAD2次测定值为 1 3和 4 2 μm。DU气溶胶浓度分布不均匀。DU氧化物中U(Ⅳ )含量接近 5 5 % ,U(Ⅵ )含量约为4 5 %。DU氧化物在模拟肺液中 7d和 30d的溶解度分别为 2 4 % ,32 %。DU气溶胶中放射性核素质量构成为2 38U(99 79% )、2 35U(0 2 1% )、2 34 U(0 0 0 1% )。结论 DU撞击燃烧形成气溶胶粒子多数可吸入 ,燃烧烟雾扩散沉降较快 ,浓度随时间变化较大。撞击形成的氧化物为UO2 、UO3和U3O8混合物。
Objective To investigate the physical and chemical characteristics of depleted uranium (DU) aerosol formed by simulated impact. Methods After DU combusting,aerosol samples were collected,and the dispersity,oxide and isotopic component,solubility in simulated lung fluids,and changes in aerosol concentration with time and distance were analyzed. Results The concentration lowered to 1/30 within 10 min.The twice determined MMAD values of DU dust were 1 ^3 and 4 ^2 μm.The concentration distribution of DU dust in chamber wasn't uniform.The oxide was composed of 55% U(Ⅳ) and 45% U(Ⅵ).The solubility of DU oxides in simulated lung fluid was 24% and 32% after one week and one month,respectively. Conclusions Most of DUs impact combustion aerosol can be inhaled.The disperse/deposit tendency and the variation of DU aerosol with time in chamber are sharp.The oxide of DU has good solubility in simulated lung fluid. ;
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2003年第5期317-319,共3页
Chinese Journal of Radiological Medicine and Protection
关键词
贫铀
气溶胶
理化特性研究
贫铀溶解度
Depleted uranium
Aerosol
Physical and chemical properties
DU solubility
