Tritium is one of the mildest radioactive isotopes.

1、

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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2、

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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3、

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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4、

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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5、

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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6、

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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7、

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.

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8、

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.

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9、

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.

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10、

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.

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11、

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.

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12、

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.

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13、

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.

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14、

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.

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15、

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.

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16、

Isotopic discrimination is not likely.

同位素甄别是不可能的.

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17、

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.

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18、

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.

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19、

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.

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20、

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.

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