1·Element 43's radioactivity makes it easy to isolate and measure.
43号元素的放射性使其易于分离和测量。
2·This work prepared the way for the discovery of the neutron by Sir James Chadwick and, above all, for the discovery in 1934 by Irène and Frédéric Joliot-Curie of artificial radioactivity.
这项工作为詹姆斯·查德威克爵士发现中子铺平了道路，尤其是为伊莲娜和弗雷德里克·约里奥特·居里在1934年发现人工放射性奠定了基础。
3·Frederic became one of her assistants and Irene taught him the techniques required to work with radioactivity.
弗雷德里克成了她的助手之一，艾琳教他放射性工作中需要掌握的技能。
4·What is the danger level for humans and radioactivity?
对人类的危险程度和放射性是什么？
5·Since the storage pools are not located within containment, a catastrophic radioactivity release to the environment could occur.
既然贮存池不再正常工作，一场释放到环境中的放射性灾难就可能发生。