radioactive element

基本解释

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，凡原子核不穩定，過一些時間自發地變成其它元素原子核的元素，稱爲放射性元素。
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.
氡是空氣中常見的放射性元素，其對人躰健康有強的危害作用，人躰主要從室內空氣中吸入氡及其子躰。
In July 1898, Madame Curie and her husband got a great success that they discovered the radioactive element, polonium, which Marie named after Poland.
1898年7月，居裡夫人和她的丈夫取得了一項極大的成就-----他們發現了一種放射性元素，瑪麗以波蘭這一名稱的字頭命名它爲釙。

They had been interested in thorium -- a radioactive element that can fuel nuclear reactors but not be processed into weapons.
World War Two ended. Enrico Fermi had been the first to use a neutron to produce the radioactive change of one element to another.

When the Sun becomes more active, this isotope becomes more abundant along with beryllium, another radioactive element.
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Litvinenko wound up dead in London from poisoning with an exotic, highly radioactive element called Polonium 210 widely believed to have come from Russia.
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