您要查找的是不是：
- A naturally occurring or artificially produced radioactive element. 放射性元素自然产生或人为制造的放射性元素
- Radium is a radioactive element. 镭是个放射性元素。
- Radium and uranium are radioactive elements. 镭和铀是放射性元素。
- Polonium is a highly radioactive element and a metalloid. 钋是高放射性的元素,金属。
- Radium and uraniumare radioactive elements. 镭和铀是放射性元素。
- How many radioactive elements do you know? 你知道多少种放射性元素?
- The decomposition of a radioactive element is the simplest example of a true first order reaction. 放射性元素的衰变是真正一级反应最简单的实例。
- In positron emission tomography (PET), a patient is injected with a radioactive element that produces photons, which are sensed slice by slice. 至于正子断层扫描（PET）的做法，受试者要先注射可产生光子的放射性元素，然后从每个切片中侦测光子的存在。
- Like Galileo, Cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity. 如同伽利略号，卡西尼号的能源来自放射性元素钸的自然衰变，产生热后再转换成电。
- An agent, such as ultraviolet light or a radioactive element, that can induce or increase the frequency of mutation in an organism. 诱变剂有机体中的一种可诱发或者增加突变的次数的因子，如紫外线或放射性元素
- The water temperature originates in geothermy warming rate and the radioactive element decay has the heat energy. 水温来源于地热增温率及放射元素的衰变产生热能。
- 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，居里夫人和她的丈夫取得了一项极大的成就-----他们发现了一种放射性元素，玛丽以波兰这一名称的字头命名它为钋。
- 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，居里夫人和她的丈夫取得了一项极大的成就-----他们发现了一种放射性元素，玛丽以波兰这一名称的字头命名它为钋。
- The findings are the first conclusive evidence for the presence of the radioactive element in lunar dirt, the researchers said. 研究人员称，这次发现是表明在月亮泥土中存在该放射性元素的首次确凿的证据。
- The rate at which radioactive elements disintegrate varies from one element to another. 放射性元素的衰变速度随元素种类的不同而不同。
- Plutonium is a radioactive element that can be used as nuclear fuel used in the manufacture of nuclear weapons, atomic energy is an important industrial raw materials. 钚是一种放射性元素，可以作为核燃料用于制造核武器，是原子能工业的重要原料。
- Radioactive elements are at the normal background level, causing no deleterious pollution. 环境辐射在正常范围之内，不存在任何人为造成的放射性污染。
- Other radioactive elements have been discovered since: actinium, radiothorium and mesothorium, ionium , etc. 自那以后发现的其他放射性元素有：锄、放射性钍和新针、镍，等等。
- I shall now speak to you of the experiments which have led us to obtain by transmutation new radioactive elements. 我现在跟诸位讲讲那些使我们通过蜕变法获得新的放射性元素的实验。
- Other radioactive elements have been discovered since: actinium,radiothorium and mesothorium,ionium ,etc. 自那以后发现的其他放射性元素有：锄、放射性钍和新针、镍，等等。
