In 1932 the Joliot-Curies made a radioactive metal bombard beryllium--which is a non-radio-active metal--with its rays. The result was that the beryllium, too, became radioactive- even more so than the original source of the rays.

• 1932年，约里奥一居里夫妇用一种放射性金属射线轰炸非放射性金属的铍元素，结果铍元素也具有了放射性，而且其放射性比原来放射性金属所发出的射线还要强。