对贝壳的同位素分析使得地质学家可以测量另一种冰川效应。
Isotopic analysis of shells allowed geologists to measure another glacial effect.
一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。
The isotopes of a given element have the same chemical properties but slightly different physical properties.
水中几乎所有的氧都是氧16，但每一千个分子中就有几个含有较重的同位素18。
Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.
在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.
当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。
Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.
铼的同位素被运用于肝癌的治疗。
钋的同位素在自然界中的确存在，但是相当罕见。
最好的核聚变材料有两种，即氢的同位素——氘和氚。
The best fuels for fusion are two types, or isotopes, of hydrogen - deuterium and tritium.
但是研究团队发现在月球上氯的同位素的比率大约是地球上的25倍。
But the team found that on the Moon it was about 25 times that of the terrestrial chlorine isotope ratio.
专家们说相关辐射危险性很小，因为氮的同位素氮16只会存在5秒钟。
Experts have played down the dangers, arguing that the isotope of nitrogen known as nitrogen-16 lasts for only five seconds.
在这个设定中，氢不再是稳定的，但是其更重些的同位素氘和氚却是稳定的。
In this scenario, hydrogen would no longer be stable, but its slightly heavier isotopes deuterium or tritium could be.
这个特征就是氧的同位素，它是由氧原子和不同数量的中子组成的。
That water signature is in the form of oxygen isotopes, atoms of oxygen with different Numbers of neutrons.
当最普通的铁（56Fe）的同位素吸收了一个中子，生成物无放射性。
When the commonest isotope of iron (56Fe) absorbs a neutron, the result is not radioactive.
这两个发明者称他们的想法为“捷希凯”，就是用激光激发的同位素分离。
The inventors called their idea Silex, for separation of isotopes by laser excitation.
地质学家在石笋上钻孔，使用铀衰变成钍的同位素的方法确定它们的年龄。
In this case the geologists drilled into the stalagmites and estimated their age from the way that uranium decays into an isotope of thorium.
在18件样本上检测了氧和锶的同位素。这两种元素在牙齿成型时，会固定在牙釉质上。
Oxygen and strontium isotopes, which are fixed in dental enamel at the time of tooth formation, were tested in 18 subjects.
铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。
The uranium or plutonium isotopes are referred to as "fissile," which means we can use them to induce fission by bombarding them with free neutrons.
氪气有几个稳定的同位素，并带来相关的大量的可以用于剖析大气来源的数据。
Krypton has several stable isotopes, the relative abundances of which can be used to parse the gas's source.
氘是氢的同位素，在地球上的海洋中广泛存在，其质量较重，很难逃离金星大气。
Deuterium is a heavier form of hydrogen that is common in Earth's oceans and that would have too much mass to escape Venus' atmosphere.
对这些珐琅碎片进行金属元素锶的同位素测试，这种元素可以揭示出个体所成长的地理区域。
These fragments were then analysed to test for particular isotopes, or forms, of the metallic element strontium, which can reveal the geological region where individuals were raised.
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。
One of the radioactive materials released by reactors is radiative isotopes of iodine, which poses a serious health risk particularly to children.
在半重水的水分子中，一个氢原子（H）被一个称之为氘（D）的氢原子的同位素所取代。
In a semiheavy water molecule, one hydrogen atom (H) is replaced with a heftier version called deuterium (D).
目前已知的最大中子数是126,82个质子和126个中子组成了元素周期表中最重最稳定的同位素。
The highest known magic number for neutrons alone is 126. Lead, with 82 protons and 126 neutrons, is thus "doubly magic" and the heaviest stable isotope in the periodic table.
碳的同位素分析与其他的研究结果告诉我们，大气中的二氧化碳大部分来源于工业生产的排放。
Analysis of carbon isotopes, among other things, shows that the carbon dioxide from industry accounts for most of the build-up in the atmosphere.
这项技术很有效，因为当水从海里蒸发，氢和氧的同位素组合升空形成云，接着飘至陆地上空降雨。
The technique works because when water evaporates at sea, a combination of hydrogen and oxygen isotopes rise to form a cloud, which then releases rain when it moves inland.
分析其头发中的同位素，显示了她在被害前曾在美国西部的山区生活过几年，这有助于警探集中调查。
Isotope analysis of her hair revealed that she spent the years before she died in America's western mountains, which helps detectives concentrate their search.
撞击会生成两种拥有117个质子的同位素，其中一种元素有176个中子，而另一种元素有177个中子。
The collision spit out neutrons to create two isotopes of an element with 117 protons, one with 176 neutrons and the other with 177.
一项由美国研究者们发表在科学杂志上的研究，就阿波罗号从月球返回地球后，带来月球上许多氯的同位素进行了分析。
A study by US researchers, published in Science, analysed chlorine isotopes of the much-studied samples, brought to Earth by the Apollo space missions.
一项由美国研究者们发表在科学杂志上的研究，就阿波罗号从月球返回地球后，带来月球上许多氯的同位素进行了分析。
A study by US researchers, published in Science, analysed chlorine isotopes of the much-studied samples, brought to Earth by the Apollo space missions.
应用推荐