Analytical Sciences

K_α/K_β Ratios of Fluorescence X-rays as an Information Source on the Depth Distribution of Iron in a Low Z Matrix

Tomáš TROJEK, Tomáš CECHÁK, and Ladislav MUSÍLEK

Department of Dosimetry and Application of Ionizing Radiation, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehová 7, 115 19 Praha 1, Czech Republic

This paper describes how the K_α/K_β count rate ratio of the characteristic X-rays of a given element can be applied to determine the depth at which a layer or a grain of that element is located. The theoretical background and a basic description of the K_α/K_β technique are given in the introduction. The experimental part of the paper deals with measurements of thick standard pure iron, intermediately thick iron foils, and layers prepared with a powder of Prussian blue. All these specimens were analyzed alone, and they were also analyzed overlaid with a low Z matrix. The light matrix consisted of sheets of paper of known thickness. Paper was chosen, because we take into account the subsequent application of this technique to surveys of historical monuments. The relation between the K_α count rate, the K_α/K_β count rate ratio, and the distribution of iron in the paper matrix are presented here.

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