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。
Non-radioactive carbon comes in two forms: 12C and the heavier (and much rarer form) 13C.
非放射性碳以两种形式存在：12C还有较重（并且更罕见）的13C。
A living organism would take in the radioactive carbon and convert it to organic material.
有生命的有机体会吸收具有放射的碳，并把它转化为有机物质。
The radioactive carbon atoms weigh 14 atomic units, whereas run-of-the-mill ones weigh 12 units.
这种放射性的碳原子为14原子单位，而普通碳原子为12原子单位。
This would involve slipping a few radioactive carbon atoms into molecules of the drugs in question.
这涉及到将很多放射性碳原子放入药物分子中的问题。
Plastic CARDS did not yet exist, so Shepherd-Barron's ATM accepted only checks laced with identifying traces of radioactive carbon-14.
那时还没有塑料卡，因此，谢泼德·巴伦的AT M机只能检测放射性碳- 14的痕迹。
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。
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.
粮食、衣服碎片、木片等等都可以通过计算它们含有多少放射性的碳元素来判断它们的年代。含的越少，年代就越悠久。
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.
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。
A warm winter, and dire warnings by scientists about climate change, convinced many that carbon emissions might be a bigger danger than nuclear accidents or radioactive waste.
刚刚过去的暖冬，和科学家们有关气候变化的灾难性警告，使许多民众都相信，二氧化碳排放要比核电厂事故或者放射性废料危险的多。
Nuclear facilities in the exhaust gas, radioactive krypton, xenon, iodine and other substances, must use activated carbon adsorption to clean them again after discharge.
原子能设施中排出的气体中，含有放射性的氪、氙、碘等物质，必须用活性炭将它们吸附干净以后再行排放。
Nuclear facilities in the exhaust gas, radioactive krypton, xenon, iodine and other substances, must use clean and activated carbon adsorption them again after discharge.
原子能设施中排出的气体中，含有放射性的氪、氙、碘等物质，必须用活性炭将它们吸附干净以后再行排放。
The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon, has allowed geologists to more precisely determine the age of rock formations.
对放射性同位素衰变的测量，尤其是铀、锶、铷、氩和碳，可允许地质学家更精确地确定岩层的年龄。
Carbon has two non-radioactive isotopes, and in material from the solar system, including most meteoritic minerals, these are mixed in a well-known ratio.
碳有两个非放射性的同位素，在太阳系的物质中，包括在大多数的陨石矿石中，它们的混合比例是众所周知的。
The stainless steel compaction head makes it ideal for decontamination of low-level radioactive waste or chemical waste that would take paint off of carbon steel.
压缩头采用不锈钢制造，非常适用于低放射性废物或化学废物(可导致碳钢涂漆掉落)的去污应用。
The tests spewed vast amounts of the radioactive molecule, carbon-14, into the atmosphere, which in turn was incorporated into the DNA of the fat cells of humans.
这些试验向空气中喷发了大量的放射性分子——碳-14。这些分子被导入到了人类脂肪细胞的DNA中。
Carbon steel is one kind of the common package materials used for storage of low and intermediate level radioactive liquid waste or disposal of low and intermediate level radioactive solidified waste.
碳钢是用于低中放废液贮存或低中放固体废物处置包装容器的一种常用材料。
Some of the carbon dioxide absorbed by plants during photosynthesis is radioactive.
植物在光合作用中吸收的一些二氧化碳具有放射性。
Some of the carbon dioxide absorbed by plants during photosynthesis is radioactive.
植物在光合作用中吸收的一些二氧化碳具有放射性。
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