Abstract
A method of determining the three main instrumental factors in an X-ray powder diffractometer is described, the factors being the receiving slit width bc, the projected width of the X-ray tube focal spot bt, and the divergence of the X-rays in the focal plane gamma . The method is based on the calculation of the minimum distortion of the diffraction peak assuming that the integrated intensity of the diffracted beam remains constant. The following optimal ratios between the instrumental factors were obtained: gamma degrees =66.8 square root bc/R tan theta and bc approximately= square root (0.2+bf)bf (where R is the radius of the goniometer circle). The application of these equations to the powder diffractometer with Bragg-Brentano geometry is discussed.
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