放射性钍

例句：

1. 1. The scientist used the radium to create a powerful radioactive beam.
   科学家使用镭产生了一股强大的放射性射线。
2. 2. The thorium mine is considered one of the most important in the world.
   钍矿被认为是世界上最重要的之一。
3. 3. The research on thorium has shown its potential as a clean energy source.
   对钍的研究显示了其作为清洁能源源的潜力。