The isotope does occur in nature but only extremely rarely.

The Mujiazhuang copper deposit with high radioactive lead isotope area of the South Qinling Orogenic Belt.

铅同位素结果研究表明,穆家庄铜矿矿石铅和近矿围岩岩石铅具有富含放射性成因铅的特点.

The image obtained on development shows the distribution of the isotope in the tissue.

这项技术可以显示出组织中同位素的分布情况.

Nuclear Chemistry: radioactive chemicals, radiation chemistry, radiation chemistry, isotope chemistry, nuclear chemistry.

核化学: 放射性化学品, 辐射化学, 辐射化学, 同位素化学, 核化学.

This indium isotope was created at the same time as the earth.

这种铟同位素与地球产生在同一时代.

Simmons : Get me a sample and some isotope readings.

弄些样本和同位素读数.

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

最后得出在铀同位素丰度比为0.1～10的范围内95%的置信水平下, 该方法的相对扩展不确定度为0.10%.

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.