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一、天然放射性元素1896年法国物理学家员克列尔(A.Bec-querel)把铀的化合物放在照像底片一起,发现洗出来的底片上有黑影,这是由于一种可以穿过包底片用黑纸的不可见射线所引起的。1898年居里夫妇从铀矿中提炼出两种有强放射能力的元素来,一种叫镭,另一种叫钋。这两种元素的放射能力比铀还要强。他们又证明了钍的放射能力。把上述这些天然放射性元素中的镭装在铅罐里,假如铅罐的壁有一定的厚度,放射
I. NATURAL RADIOACTIVE ELEMENTS French physicist A.Bec-Querel put a compound of uranium on a photographic film in 1896 and found that there was a black shadow on the negative film that was washed out, Overpack negatives with black paper caused by invisible rays. In 1898 the Curie and his wife extracted from the uranium ore two elements that had strong radioactivity, one called radium and the other called emu. Radiation of these two elements is even stronger than uranium. They proved the thorium’s radioactivity. The above-mentioned natural radioactive elements in the lead in the tank, if the wall of the lead tank has a certain thickness, radiation