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- radioactive carbon dating 放射性碳测定年龄
- When the organism dies, no new radioactive carbon is assimilated. 机体死后,不能再吸取新的放射性碳。
- Carbon dating provides the archaeologist with a basic chronological framework. 碳元素年代测定法给考古学家提供了基本的年代框架。
- They can determine the age of these bodies or artifacts by measuring the amount of radioactive carbon in them. 放射形碳元素确定年代技术。
- A living organism would take in the radioactive carbon and convert it to organic material. 有生命的有机体一定会吸收具有放射的碳,并把它转化为有机物质。
- The technique is so sensitive that it can detect a single radioactive carbon atom hiding among a quadrillion (one million billion) ordinary ones. 这项技术非常敏感,甚至能够在十的十五次方(一千万亿)个普通碳原子中找到一个放射性碳原子。
- To put an end to speculation Olsson has suggested exhuming the remains at Rozabal for DNA testing and carbon dating. 她还说,摩西可以葬在克什米尔北部的本迪布尔,一位伊斯兰先知赫鲁恩或许葬在斯利那加郊区,而所罗门则在塔赫特苏莱曼山。
- A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens. 碳4:一种碳的天然放射性同位素,原子量为4,半衰期为5,780年,用于测定古代生物标本,地质标本或考古遗迹的标本的年代
- According to the most reliable carbon dating, Newgrange was constructed in 3200 B.C., making it older than the pyramids of Giza. 根据最可靠的碳元素测时法,新庄园建于公元前3200年,故而比吉萨金字塔群还要古老。
- Of course, there are many attempts to explain these isotope variations.Regardless, variations do exist, thus making carbon dating “geologically meaningless. 虽然,对于同位素之间的变化关系也有各家说法,无论如何,这些确实存在(难以预测)的变异,使碳同位素定年法不尽然正确。
- Calvin, Melvin (1911-97) American biochemist noted for his investigations of the DARK REACTIONS of photosynthesis (using radioactive carbon). He was awarded the 1951 Nobel Prize for Chemistry. 卡尔文:美国生物化学家,他使用放射性的碳原子发现了在光合作用中的暗反应。1951年他被授予诺贝尔化学奖。
- It is attached a report of survey and carbon dating of human bones, that were found in the tomb in Shara-tala, Inner Mongolia, by research Institute of Archeology, Chinese Academy of Social Sciences. 同时,还附有中国社会科学院考古研究所对谢尔塔拉墓地所出土人骨的测定报告,以及碳14的测年数据报告。
- Radioactive ray is material thing. 放射线是实际的物质。
- 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。
- one scientist told us that carbon dating was very unreliable, 一位科学家告诉我们说碳定年是很不可信的,
- Radium and uranium are radioactive elements. 镭和铀是放射性元素。
- A certain discharge of possible radioactive effluent. 一定量的可能有放射性的废水。
- I make a carbon copy of my documents. 我用复写纸复写文件。
- Soft drinks contain carbon dioxide. 软饮料中含有二氧化碳。
- I have some carbon paper somewhere or other. 我记得我在什么地方放有复写纸。