radioactive carbon 中文意思是什麼
radioactive carbon
解釋
放射性碳- radioactive : adj. 【物理學】放射性（引起）的。n. -activity 放射性；放射（現象）。
- carbon : n. 1. 【化學】碳。2. 【電學】碳精棒[片、粉]；碳精電極。3. （一張）復寫紙。4. 復寫的副本。
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When the organism dies, no new radioactive carbon is assimilated.
機體死後，不能再吸取新的放射性碳。 -
The technique is so sensitive that it can detect a single radioactive carbon atom hiding among a quadrillion ( one million billion ) ordinary ones
這項技術非常敏感，甚至能夠在十的十五次方（一千萬億）個普通碳原子中找到一個放射性碳原子。 -
A radioactive isotope of carbon, especially carbon14
放射性碳碳的一種放射性同位素，尤指碳14 -
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，而普通碳原子為12原子單位。 -
Using carbon - dating techniques, archaeologists can determine the age of many ancient objects by measurement the amount of radioactive carbon they contain
參考譯文：在太陽深處的內核中，氦和氫經過一系列高熱原子核反應熔合作用產生了太陽的能量。 -
This would involve slipping a few radioactive carbon atoms into molecules of the drugs in question
這涉及到將很多放射性碳原子放入藥物分子中的問題。 -
A living organism would take in the radioactive carbon and convert it to organic material.
有生命的有機體會吸收具有放射的碳，並把它轉化為有機物質。 -
Food grains, scraps of cloth, bits of wood and so on can thus be dated by finding out how much radioactive carbon is left in them : the less there is, the older they are
食用的穀物、衣物的脫屑、少量木屑等等都可以通過計算放射性碳含量而得知他們距今有多久：含量越少，年代越久遠。 -
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
卡爾文：美國生物化學家，他使用放射性的碳原子發現了在光合作用中的暗反應。 1951年他被授予諾貝爾化學獎。 -
Radioactive matter is incorporated into plants, which are then eaten by animals with the result that most foodstuffs have a measurable amount of radioactivity. additional radioactivity in food comes from the naturally occurring isotope carbon 14. some cosmic radiation also reaches sea level
植物亦混有輻射物質，而動物吃掉植物，以致絕大部份食物也含有一定輻射食物輻射也來自天然的同位素碳十四，此外，宇宙輻射亦可穿越大氣層照射到海面。
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