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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;探讨了提高γ,X射线转换率的途径及减少散射射线影响的因素,包括选择不同规格的初级放射源、不同的靶片形式及源靶相对几何位置等因素对产额的影响;找出了提高信噪比的条件。按此结果制成的靶式源,通过更换靶材可以相当自由地选取X射线能量。该源可广泛用于核仪表和其他场合,弥补了现有同位素源能量不足的缺陷。作为应用之一制成的核辐射测厚仪,已成功地实现了在很宽的范围内对不同材质的厚度测量,丰富和扩大了这一应用领域,揭示了特征X射线新的应用前景。
The regularity of the characteristic X-rays generated by the primary radiation emitted by the radioisotope source in the low-energy range, the irradiation and the excitation of the target element are introduced. The ways of improving the γ-ray conversion rate and the factors of reducing the influence of the scattered radiation are discussed, including Select different specifications of primary radioactive sources, different target forms and the relative geometric position of the source target and other factors on the yield; find out the conditions to improve the signal to noise ratio. According to the results made of the target source, by changing the target can be quite free to choose X-ray energy. The source can be widely used in nuclear instrumentation and other applications to make up for the shortfall of existing isotope sources. As one of the applications of nuclear radiation thickness gauge, has been successfully achieved in a wide range of different thickness of the material measurement, enrich and expand the field of application, reveals the new characteristics of X-ray applications.