1. extraction and metallurgy of thorium 
   钍的提炼
2. Fertilizer consisting of sodium nitrate or potassium nitrate. 
   硝酯钯由硝酸钠或硝酸钾组成的化肥
3. nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru. 
   智利和秘鲁的硝酸钠沉积物中含硝酸盐的岩石或砾石。
4. A radioactive isotope of thorium with mass number228. 
   射钍钍的放射性同位，质量数为228
5. impregnate with thorium oxide to increase thermionic emission. 
   注入镀氧化物使增加热电子发射。

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• 1. 硝酸钍
  thorium chloride 氯化钍...thorium nitrate 硝酸钍...thorium oxide 氧化钍
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• 2. 氟化釷
  二氧化釷thorium fluoride...氟化釷thorium nitrate...硝酸釷thorium oxalate
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