为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
文章介绍用离子束方法分析贮氢金属中氢同位素含量与分布的实验条件与设计，并分析各自的优、缺点。
The content of deterrent and its content distribution in a new propellant were measured with gas chromatography.
大气降水的同位素含量是国家的一项基本环境数据，也是开展环境同位素科学研究和环境同位素水文地质工作必不可少的基础资料。
The precipitation isotopic content is one kind of national basic environmental data, indispensable for the environmental isotope scientific research, including environmental isotope hydrogeology.
另一方面，氪-85是铀-235和钋-239的核裂变产物。 对氪-85的同位素含量测定可以用于监督国际核公约的执行情况。
On the other hand, analyses of 85 Kr, a fission product of uranium-235 and plutonium-239, can serve as a means to help verify compliance with the Nuclear Non-Proliferation Treaty.
结果表明，等离子体在壁处的反射系数约为0.59，变换工作气体后，在第一次放电的等离子体中，由壁释放的同位素含量约占65％。
The results show that the reflection coefficient near the wall is about 0. 59, and in the plasma of the first discharge after a gas change, the wall-released isotope amount to 65% .
国内外常见的灵长类动物食性研究方法主要包括实地观察法、粪便分析法、室内笼养饲喂法、胃内容物分析法和毛发中同位素含量测定法等。
General methods for studies on primate diet at home and abroad mainly include direct observation, fecal analysis, artificial feeding, contents in stomach analysis and rumen analysis.
夏普博士说如果月球岩石中氢的初始含量接近地面的岩石，氯同位素比例比率不会这么分散。
Dr Sharp said that if lunar rocks had initial hydrogen contents anywhere close to those of terrestrial rocks, the chlorine isotope ratios would not have so much scatter.
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。
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.
他还说到，底线是“我们意识到的能够引起这么多同位素离散的过程是，月球上的氢含量比地球少10000到100000倍。”
The bottom line, he says, is that "the only process we are aware of that could cause such large isotope scatter is if the hydrogen content of the moon is 10,000 to 100,000 times less than [on] Earth.
研究人员利用所谓的离子显微镜来比较月球岩石中正常的氢元素含量及同位素氘的含量，元素氘比氢多带一个中子。
The researchers used what's called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.
这种碳同位素纪年的，实际上是测量c14的含量，测量给出一个数值。
So this carbon dating, all it's really doing is measuring that. It gives a number for it.
二者在甲苯、乙烷的碳同位素组成，氮气和汞蒸气含量等方面存在着一定的差异。
They are different from each other in toluene contents, the carbon isotope composition of ethane and the nitrogen and mercury vapor contents, etc.
应用同位素密度计在线测量氢氧化铝料浆的固体含量。
On-Line measurement of solid content in aluminium hydroxide slurry by isotopic densitometer.
近年来，随着检测灵敏度和分辨率的提高，该技术在放射性核素含量和同位素比值测定中的应用日益突出。
In recent years, with the improvement of sensitivity and resolution, its application was increasing to determine radionuclides content and isotope ratios.
一个研究小组使用一种新奇的方法来测量稀有同位素的含量，从而准确地的推测出位于新西兰的冰川年代。
A research team used a newfangled method for measuring rare isotopes to accurately date glaciers in new Zealand.
所以，目前锂同位素的含量应该比标准模式预测的少。
So, there should be less of this isotope around than the Standard Model predicts.
在中国的主要沙漠和戈壁等粉尘源区采集了地表沙或土壤（统称为表土）样品，分析了样品的碳酸盐含量和碳酸盐的碳氧同位素组成。
Surface soil samples were collected in the deserts and Gobi regions of China. The carbonate content and carbon and oxygen isotopic composition were analyzed.
硼含量和硼同位素组成有正相关关系。
The result reveals that there is positive relationship between boron content and boron isotopic composition.
在烃类天然气中，由于稀有气体的含量很微，所以其同位素组成的检测相对较困难。
The measurement of the noble gas isotopes in hydrocarbon natural gases is relatively difficult because their content is very low.
介绍了用同位素稀释质谱法测量辐照元件铀含量的方法。
The measurement methods of uranium concentrations in irradiated fuels by isotopic dilution mass spectrometry are described.
根据实验参数进行了符合效率计算，该实验方法可用于微量气体元素甚至同位素的绝对含量分析，较单独的飞行时间谱更加可靠。
The coincidence efficiency was investigated. This measurement can be used to analyze absolute content of gas atom, even of isotopes. This method is more reliable than the Time-Of-Flight spectra.
应用EA MS连线技术，对大别山东部和苏鲁地体南部超高压变质榴辉岩及其中的磷灰石进行了碳的含量和同位素分析。
The carbon concentration and isotope composition of ultrahigh pressure eclogite and apatite separate from the Dabie-Sulu orogen were analyzed by the EA-MS online technique.
本文讨论了氢氧化铝料浆的固体含量和密度之间的关系及固体含量的密度检测方法。介绍了同位素密度计的现场应用情况。
This paper discussed the relationship between solid content and density of aluminium hydroxide slurry and describes the measurement method and in situ applications of isotopic densitometer.
应用EA - MS连线技术，对大别山东部和苏鲁地体南部超高压变质榴辉岩及其中的磷灰石进行了碳的含量和同位素分析。
The carbon concentration and isotope composition of ultrahigh pressure eclogite and apatite from the Dabie-Sulu orogen were analyzed by the EA-MS online technique.
溶液中加入铱元素进行铼同位素的质量分馏校正，在常规的溶液雾化进样条件下，采用同位素稀释法可准确测定纳克级的铼含量。
Combining the isotopic dilution (ID) method with the on-line fractionation correction method, the rhenium content can be determined accurately at sub-nanogram level using the normal solution n.
不过，变质岩中微量碳酸盐的碳含量和碳同位素比值分析能够对原岩类型提供有效的判别。
Nevertheless, the combined carbon content and isotope analyses of micro-carbonate in metamorphic rocks can be used to make a distinction in origin between sedimentary and igneous protoliths.
介绍了采用同位素稀释质谱 法（IDMS）测定 冻干人尿样品中镍、铜、铅的含量。
The method of determining Ni, Cu and Pbi n urine with isotope dilution mass spectrometry(IDMS)is described.
即不同金管之间气态烃的相对含量和碳同位素组成差异很小。
The proportional and carbon isotopic compositions of hydrocarbon and non-hydrocarbon gases are almost identical among these gold capsules.
③矿物学方面，海绿石、菱铁矿结核、硼元素含量和碳氧同位素资料也表明沉积环境由海→陆的过渡性质。
In terms of mineralogy, glauconites, siderite nodules, boron contents and carbon isotopes also show that the sedimentary environment is transitional.
李世珍 肖应凯 研究员 ：本文系统而简要地介绍了硼的分离纯化，硼含量和硼同位素组成的测定。
Abstr act: In this study, the methods of preparation and isotopic measurement of boron are introduced systematically and briefly.
应用推荐