Fig. 1. Cross-sectional view of the KRISS FAC L1 for low-energy X-ray measurement. The front wall was composed of 10-mm-thick stainless steel. The diaphragm was supported by a tungsten holder. Front view (a) and side view (b). Note that the units are given in mm and the figures are not to scale. KRISS FAC, Korea Research Institute of Standards and Science free air chamber.
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