There are several ways to separate excited from unexcited molecules, thus harvesting the desired isotope.

1、

The isotope does occur in nature but only extremely rarely.

钋的同位素在自然界中的确存在,但是相当罕见.

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2、

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.

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3、

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.

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4、

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.

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5、

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.

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6、

Simmons : Get me a sample and some isotope readings.

弄些样本和同位素读数.

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7、

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%.

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8、

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.

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9、

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.

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10、

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.

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11、

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.

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12、

Later he named these separate forms isotopes.

后来他称这些不同的形式为同位素.

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13、

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.

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14、

Tritium is one of the mildest radioactive isotopes.

氚是最和缓的放射性同位素之一.

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15、

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.

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16、

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.

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17、

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.

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18、

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.

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19、

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.

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20、

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.

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