处理同时进行的辐射泄漏的风险，以及处理放射性钍是困难和昂贵。
Processing runs the risk of radiation leaks, and disposing of the radioactive thorium is difficult and costly.
这颗晕星不同于大多数超新星，它吐出的许多元素比铁还重，其中包括放射性钍和铀。
Unlike most supernovae, this one spewed lots of elements far heavier than iron, including radioactive thorium and uranium.
氦是钍和铀元素数千年放射性衰变的副产品。
Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.
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