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

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.

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.

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.

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.

It is important to avoid the use of uranium compounds of unspecified isotopic composition.

要避免使用那种非专用的同位素成份的铀化合物.

An isotopic analysis of the grains has made that fear come true.

一项对这些颗粒的同位素分析让这种担心成真了.

The isotopic signatures of most ancient limestones indicated the same process.

大多数古代石灰岩的同位素特征说明了同样的过程.

The environmental isotopic tracer is a new technique developed in recent years.

环境同位素示踪技术是近几年新发展起来的一项新技术.

Isotopic and trace elements data show that mineralizing materials are of multi-sources.

同位素及微量元素研究表明,成矿物质具有多源性.

The results agree with those by using isotopic method reported in the literature.

与文献报道的同位素方法研究结果相同.

The isotopic abundance ratio and content are determined with isotopic mass-spectrometry.

文章用同位素质谱法测定了辐照堆元件铀的同位素丰度比和含量.

This paper determined the sulfur isotopic composition of the Mianning REE deposit, Sichuan Province , China.

分析了四川冕宁大型稀土矿床硫同位素组成.

The isotopic dating and fossil geochronometry are the basic methods of ophiolite geochronometry.

同位素测年及化石年代学法是蛇绿岩年代学研究的基本方法.

Isotopic discrimination is not likely.

同位素甄别是不可能的.

Stable isotopic method can be used effectively in the diagenetic research of deep water carbonate rocks.

稳定同位素方法可以有效地应用于深水碳酸盐岩的成岩作用研究.

Isotopic scans demonstrate a nonfunctioning ( cold ) nodule that does not concentrate radioiodine.

同位素扫描显示无功能 ( 冷 ) 节,它不能浓集射碘.

An efficient algorithm finding the isotopy class of the latin squares is given.

提出了一种拉丁方合痕分类的快速算法,该算法结构简单,复杂度低.

Here we give the equations for the isotropic solids.

在这儿,我们给出适用于各项同性固体的方程.

Isotropic bi-materials with high comprehensive properties are widely used in engineering fields.

各向同性双材料以其优越的综合性能在工程上的应用日益广泛.

Are Gamma-ray Bursts due to Isotropic Fireballs or Cylindrical Jets?

伽玛射线暴:各向同性火球还是柱形喷流?