Abstract
The K X-ray rate of elements in thick-target rock samples has been measured by photoionization by an 55Fe radioactive source. A problem in determining the concentration of elements in a complex chemical environment by X-ray fluorescence is the influence of the presence of one element on the X-ray rate of another. We are studying this effect for calcium and sulfur in rock samples (thick samples) and thin samples of pure molecules. The apparatus consists of a SiLi detector coupled to a vacuum chamber by a 0.3 mil Be window. The thin sample data are compared to a simple model of X-ray attenuation as a function of sample thickness. The thick sample data are compared with an approximate model which includes second order interactions between the calcium X-ray and the sulfur.
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