Abstract
Wide band pass X-ray monochromators using reflection/transmission mirror and reflection mirror/absorber combinations were applied to the synchrotron radiation excited energy dispersive X-ray fluorescence analysis. Transmission mirrors were made from soap films or thin mylar films and were used as high pass filters. Characteristics of both films are described in detail. The width of band pass thus obtained was wider than 20%. Minimum detection limits in relative concentration and absolute amount are of the order of 0.1 ppm and less than 0.1 pg, respectively, when there is no line interference.
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