The law of characteristic X-rays emitted by target element under the radiation of isotope source in a range of low energy is discussed.
介绍了在低能范围内利用放射性同位素源发出的初级射线，照射和激发靶片元素产生的特征X射线的规律性；
One way to tell if life is the source of the gas is by measuring isotope ratios.
其中一个方法判断生活的来源是通过测量气体同位素比率。
The application value of traditional method to explore the oil and gas source using carbon isotope was bounded by the type and maturity of source rock.
利用气体碳同位素探索油气来源的传统方法由于受源岩类型、源岩成熟度等因素的影响，其实际应用受到很大的限制。
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