Landa E R
Health Phys. 1987 Mar;52(3):303-10. doi: 10.1097/00004032-198703000-00004.
Alkaline circuit and mixed, acid and alkaline circuit U mill tailings sampled at an inactive mill site near Monticello, UT, and tailings from an active, acid-leach U mill were separated into particle-size fractions ranging from +10 mesh to -325 mesh by dry and wet separation techniques. The 226Ra contents and 222Rn emanation coefficients of these fractions were determined. Dry tailings show a high degree of aggregation that tends to mask the relation of properties, such as Ra content and Rn emanating power, to dispersed-particle size. Coarse-tailings fractions (+325 mesh) had emanation coefficients which were from 25 to 45% lower than those of their fine-fraction counterparts. Emanation coefficients measured for tailings derived from a salt roast/carbonate-leach process suggest that such are roasting does not lead to reductions in Rn emanation in the tailings derived therefrom.
对犹他州蒙蒂塞洛附近一个废弃铀矿场采集的碱性回路及混合、酸性和碱性回路铀矿尾矿，以及一个正在运行的酸浸铀矿的尾矿，通过干法和湿法分离技术将其分离成粒度范围从+10目到-325目的各个粒级。测定了这些粒级的镭-226含量和氡-222析出系数。干尾矿表现出高度的团聚性，这往往会掩盖诸如镭含量和氡析出能力等性质与分散颗粒大小之间的关系。粗尾矿粒级（+325目）的析出系数比其细粒级对应物低25%至45%。对盐焙烧/碳酸盐浸出工艺产生的尾矿测得的析出系数表明，这种焙烧不会导致由此产生的尾矿中氡析出量减少。
