西方公司打算扩大中国以外的稀土矿产量，但这其中储量较大的稀土矿比中国华南的稀土矿复杂的多，这些矿往往伴生着放射性的铀和钍，开采起来很复杂。
Companies want to expand production outside China, but most rare-earth deposits, unlike those in southern China, are accompanied by radioactive uranium and thorium that complicate mining.
用等离子体发射光谱法测定了稀土铌钽矿中的稀土元素和钍量。
Rare earth elements and thorium in RE-Nb-Ta ores were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES).
第三十八条铀(钍)矿开发利用单位应当制定铀(钍)矿退役计划。
Article 38 Any unit that exploits uranium (thorium) mine shall draw up plans for decommissioning of uranium (thorium) mines.
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