Under 0.1 ~10 isotope ratio range and 95 % confidence, the relative expanded uncertainty of the technique %.

Isotope tracing technology was used on animal experiment since 1920 s.

同位素示踪技术是20世纪20年代开始用于动物试验.

An isotope log of water injection profile is affected by many factors, specially the string contamination.

同位素注水剖面测井受多种因素, 特别是管柱沾污的影响,使得测井资料质量差或根本无法解释.

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.

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.

Later he named these separate forms isotopes.

后来他称这些不同的形式为同位素.

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.

Tritium is one of the mildest radioactive isotopes.

氚是最和缓的放射性同位素之一.

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 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.

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.