They had been interested in thorium — a radioactive element that can fuel nuclear reactors but not be processed into weapons.
他们当时对一种放射性元素钍很感兴趣，这种元素能驱动核反应堆，却不能制造生产成武器。
The undisputed link between the tests and a radioactive element in baby teeth provided much of the impetus for the 1963 test Ban Treaty, which outlawed above-ground nuclear weapons-testing.
试验与婴儿牙齿里放射元素之间的无可争辩的联系对于推动1963年的《禁止核试验条约》起了至关重要的作用。该条约宣布地面进行核武器试验非法。
That essentially means that it uses a radioactive element called americium-241 to spot smoke or harmful gasses.
从字面上可以了解到，它采用放射性元素镅241来探测烟雾或者有害气体。
That essentially means that it uses a radioactive element called americium-241 to spot smoke or harmful gasses.
从字面上可以了解到，它采用放射性元素镅241来探测烟雾或者有害气体。
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