This radioactive element has a half-life of some 5, 700 years.
这种放射性元素半衰期约为5700年。
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。
In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.
在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。
Radon is a common radioactive element in air, which is strongly harmful to the man's health. Man inhales radon and its daughters mainly from the indoor air.
氡是空气中常见的放射性元素，其对人体健康有强的危害作用，人体主要从室内空气中吸入氡及其子体。
By surveying the data, we concluded that the radioactive element contents are higher in the alteration zone, middle in the mixed granite and lower in the ore veins.
从实测结果可知，放射性元素在不同岩性中的含量以蚀变带最高，混合花岗岩次之，石英(矿)脉中最低。
By surveying the data, we concluded that the radioactive element contents are higher in the alteration zone, middle in the mixed granite and lower in the ore veins.
从实测结果可知，放射性元素在不同岩性中的含量以蚀变带最高，混合花岗岩次之，石英(矿)脉中最低。
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