Nature, most elements have two or more isotopes, the same kinds of elements in the quality of the various isotopes of different, but the types and proportion constant (except for radioactive elements). In 1961, the carbon content of the most abundant in nature, a kind of isotope, carbon-12 atom of a quantity and quality of C as a 12 mass units to it as "benchmarks" for all isotopes of an element according to the average abundance The ratio of the benchmark is the atomic weight of this non-prime, that is listed in the periodic table of atomic weights.

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As a result, all living organisms absorb an equilibrium concentration of radioactive carbon.

作為一個(gè)結(jié)果，所有的活生物體吸收平衡濃度放射性碳91嫩草国产在线观看免费。

The technique is so sensitive that it can detect a single radioactive carbon atom hiding among a quadrillion ordinary ones.

這種技術(shù)是如此的靈敏以至于可以在百萬的四次方個(gè)原子中找到某一個(gè)放射性碳原子香港日本韩国一级二级三级网站。

The testing of nuclear weapons in the 1950s spewed a lot of radioactive carbon-14 into the air.

上個(gè)世紀(jì)50年代的核武器試驗(yàn)的結(jié)果導(dǎo)致向空氣中排放了大量的放射性碳14。

Working with a captive breeding colony in Germany, Christian Voigt of the Leibniz Institute for Zoo and Wildlife Research in Berlin and Professor John Speakman of the University of Aberdeen fed long-tongued bats sugar containing non-radioactive carbon-13 and then measured the amount of carbon-13 in the bats' exhaled breath.

德國萊布尼茲動物園與野生動物研究所的Christian Voigt與阿伯丁大學(xué)的教授John Speakman一起共同進(jìn)行了該項(xiàng)研究欧美性爱视频免费的，他們用含有非放射性碳13的糖類食物來喂食長舌蝙蝠成年人黄色视频欧美，然后檢測蝙蝠呼出的氣體中碳13的含量看黄片在线天堂在线。

Libby discovered radioactive carbon element dating method and solved the puzzle of earth and human history.

利比發(fā)現(xiàn)的放射性碳14定年法，解答了地球與人類歷史上的疑惑免费黄a网站。

According to radioactive carbon dating and after correction, age about 6,000 years BC.

據(jù)放射性碳素?cái)啻⒔?jīng)校正高清激情18性爱啊啊在线欧美日韩不卡，年代約為公元前6000年。

The radioactive carbon atoms weigh 14 atomic units, whereas run-of-the-mill ones weigh 12 units.

這種放射性的碳原子為14原子單位95视频网址入口在线观看，而普通碳原子為12原子單位日韩欧美在线观看综合网另类。

The radioactive carbon atoms weigh 14 atomic units, whereas run-of-the-mill ones weigh 12 units.

放射性碳元素的原子量是14個(gè)單位，一般碳元素的原子量是12個(gè)單位国产猛烈高潮大叫视频。