isotopes

The large number of radioactive isotopes among the heavy elements fit into three series.

重元素中的大量放射性同位素分属于三个系列.

Indirect ionization by neutrons can also result from fission of plutonium or uranium isotopes.

通过使钚或铀同位素裂变,中于也能产生间接的电离作用.

The interval is two mass units because these isotopes of the elements differ by two neutrons.

因为这些元素的同位素相差两个中子,所以其间隔为两个质量单位.

Plant and soil samples collected from the Yangtze River ( Changjiang) drainage basin were analyzed for carbon content, stable carbon isotopes and lignin phenol content to investigate the characteristics of terrigenous organic matter.

为探讨长江流域中植物和土壤的木质素特征，应用碱性氧化铜分解-气相色谱检测法对长江流域的典型植物和土壤样品中的木质素进行了测定分析。

the many isotopes of carbon

碳的诸多同位素

The studies of Sr and REE and Sr and Nd isotopes geochemistry in the western Pacific marginal sea will play an important role in the study of the sea floor spreading of western Pacific marginal sea and the evolution of the paleoceanography environments and Eastern Asia continent environments.

开展以Sr和REE等微量元素以及Sr、Nd稳定同位素地球化学研究，对于解决西太平洋边缘海的海底扩张和古海洋及东亚大陆的环境变迁有重要的意义。

This method was used to study radium isotopes distribution in seawater of Jiaozhou Bay.

研究了胶州湾水体镭同位素的分布。

The theory of thermal ionization mass spectrometry has been deeply discussed and the procedures for high-precision measurement of isotopes of lithium, indium and cerium have been established.

该成果对质谱中的热电离理论进行了较深入地讨论，建立了高精度质谱测定锂铟铈同位素的方法。

A detailed search for the isotopes of all the elements required a more preci se technique.

仔细研究所有元素的同位素需要更精密的技术.

For that reason, however, separating the isotopes of an element can be exceedingly difficult and costly.

不过, 也正因为这样, 要把某一元素的各同位素分离开来,就可能是极其困难的事,要付出很高的代价才能办到.

Tritium is one of the mildest radioactive isotopes.

氚是最和缓的放射性同位素之一.

Study on activity measurements of lutecium isotopes

Lu同位素的活度测量研究

Permission from director general of civil aviation is required for booking radio isotopes with airlines.

预定空运放射性同位素时，应获得民航局局长的批准。

Later he named these separate forms isotopes.

后来他称这些不同的形式为同位素.

A Mathematical Model in Separation of Boron Isotopes by Chemical Exchange Reaction and Distillation

硼同位素在分离生产过程中的数学模型研究

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.

Ions of different isotopes converge at different points on the photographic plate.

在照相底板上不同的同位素的离子会聚于不同点.

The application of thermal simulation on-line technology of carbon isotopes in the gas geology research

热模拟在线同位素技术在天然气地学研究中的应用

More reactive are the heavier isotopes of hydrogen, deuterium and tritium.

更为活跃的是氢的较重同位素, 氘和氚.

Depth Profiling of Light Isotopes by Use of Nuclear Reaction Energy Analysis

用核反应能谱法测量轻同位素的深度分布

Extensive research has shown that fractional atomic masses always mean mixture of isotopes.

进一步的研究揭示出:部分原子质量常是同位素的混合物.

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.

The radium isotopes are absorbed to an appreciable extent through the human and animal gut.

镭的同位素通过人和动物的肠子时有很大部分被吸收.

Atoms of the same element that differ in their atomic weight are called isotopes.

具有不同原子量的同一种元素被称为同位素.

Rapid concentration in-situ and γ spectrum analysis of radium isotopes in large volume seawater

大体积海水镭同位素现场快速富集与γ谱直接测定

Study on the liquid complex of boron isotopes separation by chemical exchange reaction and distillation

精馏与化学交换法分离硼同位素中液相络合剂的研究

Threshold chemical reaction method in molecular forms for laser-based separation of uranium isotopes

阈能反应分子法激光分离铀同位素

Study of the Paleoclimate Based on the Comparison Between Thermal Ionization Mass Spectrometry Uranium Series Dating and Oxygen Isotopes

基于热电离质谱铀系定年与氧同位素对比的古气候研究

An investigation of sample treatment to determine th isotopes in sediments

沉积物中钍同位素分析样品的处理方法比较研究

International Thermonuclear Experimental Reactor ( ITER) is one of the largest international cooperative projects following International Space Station. The purpose of it is to achieve nuclear fusion through isotopes of hydrogen: deuterium and tritium.

国际热核聚变实验反应堆（简称ITER）是继国际空间站等以来最大的国际合作项目之一，其目的是用氢的同位素氘和氚来实现核聚变。