Balancing Ross filters in x-ray diffraction of liquids

In x-ray diffraction techniques for liquids, balanced (Ross) filters can be used for obtaining an essentially monochromatic beam. This article describes how correct balancing can be tested experimentally. The method is based on the use of a strongly fluorescent solution (e.g. for Mo Ka radiation a solution containing Y). The filters are then balanced until the fluorescent radiation is equally absorbed by both filters. The measurements are carried out under conditions identical to those existing in the actual experiments.