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；
The law of characteristic X-rays emitted by target element under the radiation of isotope source in a range of low energy is discussed.
虽然处在项目研究的初级阶段，但孩子们也受益匪浅，激发他们广泛运用终身受用的技能。
The programme, even though in its infancy, has so far greatly benefitted our students and imbued them with a broad set of lifelong skills.
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