Measurements of the X-ray transmission topography on radiation entrance windows for the position sensitive proportional counters on board the german as

Abstract We have been developing relatively large area radiation entrance windows for the position sensitive proportional counters (PSPC) on board the X-ray astronomy satellite ROSAT. A method is described to measure the transmission topography in the soft X-ray energy range 1.75 > E > 0.1 keV across the effective area. The results are presented as contour plots in a gray scale.