About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.
然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。
Tritium is one of the mildest radioactive isotopes.
氚是最和缓的放射性同位素之一。
In the presence of naturally radioactive isotopes and fission product...
程序在有天然放射性同位素和裂变产物存在下也是可用的。
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。
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。
Howard: They were injecting rats with radioactive isotopes and one of the techs got bit.
霍华德：他们给老鼠注射了放射性同位素，但其中的一名技术员被咬了。
Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.
一旦反应堆关闭，它仍热存在有来自其他放射性同位素踪迹的衰变热。
Using radioactive isotopes, scientists discovered that trees share water and nutrients with others in need.
科学家通过同位素观测发现，树木会与有需求者分享水和养料。
Technically, AFLP is quite complicated and often involves the use of radioactive isotopes. Also, AFLP requires the high quality template DNA.
AFLP技术较复杂，而且经常使用放射性同位素，对模板dna质量要求也较高。
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。
Gamma rays have proved very helpful in medicine and industry. These rays are also given off by radioactive isotopes obtained as by-products in production processes.
射线已被证实在医学和工业上有很大的用处，这些射线是在生产过程中由放射性同伴素释放出的副产品。
Gamma rays have proved very helpful in medicine and industry. These rays are also given off by radioactive isotopes obtained as by - products in production processes.
射线已被证实在医学和工业上有很大的用处，这些射线是在生产过程中由放射性同伴素释放出的副产品。
But if people at risk receive tablets containing non-radioactive iodine, this reaches the thyroid first and effectively prevents the radioactive isotopes being absorbed.
但是如果处于危险环境的人们预先摄入含有非放射性碘的药物，这些碘就会先到达甲状腺并且有效地防止对放射性的碘的吸收。
Most of the samples that have passed across Hasegawa's desk have proved to be within the legal consumption limit of the radioactive isotopes cesium 134 and 137 and iodine 131.
摆放在长谷川桌子上的大部分检测样品，都被证明所含的放射性元素铯- 134，铯- 137和碘- 131均在可安全范围内。
Canada led the world in the development of radioactive isotopes for medical diagnosis and therapy, says Jacalyn Duffin, a medical historian at Queen's University in Ontario.
安大略省奎恩大学的医学史学家JacalynDuffin说，加拿大在医学诊断和治疗领域应用放射性同位素的进程是世界领先的。
Since the previous edition, there has been a growing trend towards the replacement of procedures using radioactive isotopes, and the current edition incorporates these newer technologies.
从以前的版起，有增长使用放射性的同位素倾向于程序的替换，并且当今的版包含这些新技术。
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。
And they still may need to retest for other radioactive isotopes that had been found in the seawater around the No. 2 reactor, including troubling quantities of cesium, barium, cobalt and lanthanum.
并且，他们或许要对2号反应堆周边其他放射性同位素的含量，包括对铯、钡、钴、镧的浑浊度，进行重新检测。
Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
Sims USES radioactive clocks to decipher volcanic processes, measuring and comparing two isotopes of radon.
西姆斯使用放射性计时器测定并比较氡的两种同位素，以此来解密火山的活跃程度。
Ephraim Fischbach, a physics professor at Purdue, was looking into the rate of radioactive decay of several isotopes as a possible source of random numbers generated without any human input.
普渡大学物理教授EphraimFischbach，将探测几种同位素的放射性衰变速率的方法作为一种没有人为输入因素干扰的产生随机数的可能方法。
One of the radioactive materials released by reactors is radiative isotopes of iodine, which poses a serious health risk particularly to children.
反应堆释放的一种放射性物质就是碘的同位素，其会人们尤其是儿童造成严重的健康损害。
The results obtained suggested that most isotopes produced artificially are radioactive.
试验结果表明多数人工制造的同位素都具有放射性。
However, some of the minerals contain xenon isotopes unlike those usually produced by radioactive decay of uranium.
然而，有些含氙同位素的矿物并非如此，是由铀的放射性衰变产生的。
Its stable isotopes are all end products of radioactive decay of uranium and other heavy elements.
其稳定的同位素为铀和其它重金属放射衰变后的最终产物。
Stable isotopes are non-radioactive, so they are safe and suitable for the study of human nutrition.
稳定同位素不具有放射性，使用安全，适于人体营养学研究。
Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
几种氡的同位素的放射性气体，是放射性物质衰变的产物。
Seventy of the 350 naturally occurring isotopes are radioactive.
自然界有350种天然同位素，其中70种有放射性。
Seventy of the 350 naturally occurring isotopes are radioactive.
自然界有350种天然同位素，其中70种有放射性。
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