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同位素是具有相同原子序数的同一化学元素的两种或多种原子之一,在元素周期表上占有同一位置,化学行为几乎相同,但原子量或质量数不同,从而其质谱行为、放射性转变和物理性质有所差异。自然界中存在的每一种元素都有自己的同位素。有些同位素比较稳定,不会发生结构上的变化,这是稳定同位素;而另一些同位素会不停地向四周发出各种射线,这就是有着多种用途的放射性同位素。随着科学的发展,人们用人工方法制成了越来越多的放射性同位素,目前,几乎所有的元素都有了
Isotopes are one of two or more atoms of the same chemical element with the same atomic number, occupy the same position on the periodic table of elements with nearly identical chemical behavior but differ in atomic mass or mass, and thus their mass spectral behavior, radiotransformation and physics The nature is different. Every element in nature has its own isotope. Some isotopes are relatively stable, structural changes will not occur, which is a stable isotope; while other isotopes will continue to emit all kinds of radiation around, which is a multi-purpose radioisotope. With the development of science, more and more radioisotopes have been artificially made by man, and at present, almost all the elements are available