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我国南方各省以独居石为原料生产的混合稀土氯化物产品,其放射性污染问题,一直未能很好解决。尽管在生产工艺上采取了盐酸优溶和硫酸钡沉镭的净化手段,即使产品初出车间时U_(238) Th_(232) Ra_(228)等放射性元素的含量
The mixed rare earth chloride products produced by monazite in the southern provinces of our country have not been well solved because of their radioactive pollution. Although the purification process of hydrochloric acid and barium sulfate radium has been adopted in the production process, even though the content of radioactive elements such as U_ (238) Th_ (232) Ra_ (228)