某些物质的原子核能发生衰变,放出我们肉眼看不见也感觉不到,只能用专门的仪器才能探测到的射线,物质的这种性质叫放射性物质。 放射性物质是那些能自然的向外辐射能量,发出射线的物质。一般都是原子质量很高的金属,像钚 ,铀,等。放射性物质放出的射线有三种,它们分别是α射线、β射线和γ射线。
第七類:放射性物质(Radioactive substances) 指能自原子核内部能自发地、不断地放射出人感觉器官不能察觉的放射
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放射性物质包装 radioactive materials packaging
天然放射性物质 NORM ; naturally occurring radioactive materials
放射性物质化学 chemistry of radioactive substances
人工放射性物质 artificial radioactive substance ; substance, artificial radioactive
强放射性物质 hot material ; material hot
低比度放射性物质 low specific activity material
放射性物质运输指数 Transport Index for Radioactive Materials
强放射性物质实验室 hot laboratory
捉用放射性物质 radiological warfare agents ; radioactive contaminants
早期地球含有丰富的放射性物质。
居里夫人现在的名气到达顶峰,从1922年开始,她是医学学会的成员,研究放射性物质的化学性质及其医学应用。
Marie Curie, now at the highest point of her fame and, from 1922, a member of the Academy of Medicine, researched the chemistry of radioactive substances and their medical applications.
基于这项研究的结果,玛丽·居里获得了理学博士学位,1903年,玛丽和皮埃尔与贝克勒尔共同获得了诺贝尔物理学奖,以表彰他们发现了放射性物质。
Based on the results of this research, Marie Curie received her Doctorate of Science, and in 1903 Marie and Pierre shared with Becquerel the Nobel Prize for Physics for the discovery of radioactivity.
As carefully as people work with radioactivity here, and using often much, much safer radioactive materials than radium bromide, and using them, and special hoods, and having special procedures, they still do a lot of checking with these Geiger counters to make sure everything's safe.
虽然在这里人们,用放射性物质都非常的小心,而且通常用的材料放射性,都比溴化镭要小得多,并且用的时候,都用特殊的容器,特殊的操作过程,但我们平时仍会用。
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