thorium

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

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

2.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.

但是一个事实引起了我注：某些矿物质(青铀矿物质、铀云母或钙铀云母)活性比根据其铀或针含量所判断要高。