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- A radioactive isotope of carbon, especially carbon 14. 放射性碳碳的一种放射性同位素，尤指碳14。
- Tritium is one of the mildest radioactive isotopes. 氚是辐射最和缓的放射性同位素之一。
- The breakdown of radioactive isotopes goes on at constant rates. 放射性同位素的衰变在恒定的速率下进行。
- A radioactive isotope of thorium with mass number228. 射钍钍的放射性同位，质量数为
- The inferno spewed a deadly plume of radioactive isotopes into the atmosphere. 这个象炼狱般的地方将一缕致死的放射性同位素喷入大气层。
- A radioactive isotope of iodine widely used as a tracer in medical diagnosis. 放射性碘碘的一种放射性同位素，广泛地用于医学诊断作为追踪剂
- A naturally or artificially produced radioactive isotope of an element. 放射性同位素天然存在或人工合成的某种元素的有放射性的同位素
- There are two main types of uses of radioactive isotopes in biochemistry. 在生物化学中，放射性同位素主要有两方面的应用。
- Expectant mothers may not do work connected with radioactive isotopes. 怀孕女工不得做与放射性同位素有关的工作。
- Caesium-137 is a radioactive isotope, formed mainly through nuclear fission. 铯-137是一种放射性同位素，主要由核分裂产生。
- The large number of radioactive isotopes among the heavy elements fit into three series. 重元素中的大量放射性同位素分属于三个系列。
- The importation of the radioactive isotope, radiation equipment and other radioactive materials should come up to applicable state regulations. 进口放射性同位素、射线装置和含有放射性物质的物品的，按照国家有关规定办理。
- The meteorite, which recently fell to the tropical island in Pacific Ocean, proved to be the present well of the thinnest radioactive isotope! 最近落到在太平洋的热带岛陨石证明是最薄的放射性的同位素的现在井!
- Autoradiography A technique whereby a tin slice of tissue containing a radioactive isotope is placed in contact with a photographic plate. 放射自显影术：将含有放射性同位素的一小薄片生物组织与感光层接触的一项技术。
- We can talk about the half-life of a radioactive isotope, and indeed we can measure and state very very precisely what that half-life is. 我们可以谈论放射性同位素的半衰期，我们确实可以非常准确地测量和描述半衰期是什么。
- Any radioactive isotope introduced into the body to study metabolism or other biological processes. 为了研究新陈代谢或其他生物学过程而引入身体的放射性同位素。
- There are some radioactive isotopes which are produced artificially by bombardment of nuclei with neutrons. 有几种同位素是用人工方法;以中子轰击原子核生产出来的.
- To increase the amount of one or more radioactive isotopes in(a material, especially a nuclear fuel). 添加元素增加一种同位素或更具有放射性的核素的数量于（一种物质，尤其是核燃料）
- A densimeter with radioactive isotope beseemed experiment teaching for speciality of nuclear engineering and nuclear technology in higher education is presented. 摘要提出了一种适合于施工程与核技术专业本科生实验教学的放射性同位素密度计。
- "What it amounts to," said Billings, "is that The Goose can convert any radioactive isotope into a stable one.It has developed the perfect defense against radiation sickness. “也就是说，”比林斯说道，“这只鹅能够把任何放射性同位素转变成稳定的同位素，它产生了一套完整的放射性疾病防御系统。”
