thorium

A stepwise carbochlorination-chemical vapor transport(SC-CVT) technique is proposed for separation of thorium from mixed bastnaesite-monazite concentrate.

以氟铈-独居石混合稀土为研究对象,采用分步选择热氯化-化学气相传输反应(SC-CVT),实现钍与其它稀土元素分离。

But an unexpected fact was noted: certain minerals( pitchblende, chalcolite, autunite) had a greater activity than might be expected on the basis of their uranium or thorium content.

但是一个意外事实引起了我注意：某些质(青质、云母或钙云母)活比根据其或针含量所判断要高。