钋的同位素在自然界中的确存在，但是相当罕见。
是磷元素唯一稳定的同位素。
本工作对离心法分离钨的同位素进行了研究。
The separation of tungsten isotopes by gas centrifuge is studied.
一项对这些颗粒的同位素分析让这种担心成真了。
An isotopic analysis of the grains has made that fear come true.
人们发现，自然界里许多元素，都是各种不同的同位素的混合物。
Many elements in nature are found to be mixtures of different isotopes.
但是同位素的用处更多。
经过了上千年，这两种碳同位素的比例一直是不变的。
For thousands of years, the ratio between the two has been the same.
元素后面的数字表明特定同位素的身份。
The number after the element name identifies the specific isotope.
地球上没有稳定同位素的最轻的物质是什么？
What is the lightest element on Earth, with no stable isotope?
管理的某些放射性同位素也可以治疗某些癌症，如甲状腺癌。
Certain radioisotopes can also be administered to treat certain cancers such as thyroid cancer.
单个元素的不同形式称为同位素。
重元素中的大量放射性同位素分别属于三个系列。
A large number of radioactive isotopes among the heavy elements are of three series.
重元素中的大量放射性同位素分属于三个系列。
The large number of radioactive isotopes among the heavy elements fit into three series .
原子核质量和大小的不同引起同位素移动。
Changes of nuclear mass and nuclear size cause isotope shifts.
所以，目前锂同位素的含量应该比标准模式预测的少。
So, there should be less of this isotope around than the Standard Model predicts.
硫酸盐不仅是常见矿物，还是自然界少数几个具有氧同位素非质量分馏效应的矿物之一。
They are among the few minerals that show mass independent fractionation of oxygen isotopes.
所有的放射性同位素都是用这种方法或其它遥控法制备的。
All radioisotopes are prepared in this way, or by other methods of remote control.
于是，放射性同位素发出的辐射冲击将会破坏邻近的肿瘤细胞。
Then the blast of radiation emitted by the radioisotope would destroy the... tumor cells nearby.
砂金中的微量铅同位素分析具有特殊的意义。
The isotope analysis of minim lead in the gold dust has special meaning.
给我一些样本和同位素的读数。
铅同位素特征可作为找矿的重要标志。
We therefore can use the characteristics of the lead isotope, which serve as an important...
铅同位素特征可作为找矿的重要标志。
We therefore can use the characteristics of the lead isotope, which serve as an imp...
铅同位素特征可作为找矿的重要标志。
We therefore can use the characteristics of the lead isotope, which serve as an imp...
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