X-ray windows, comprehensive:a support frame that circles an opening and has a top and a bottom, with the top and the bottom running parallel to each other,a boron film and an aluminium film, which exceed the opening of the support frame,where the boron film has a weight percentage of boron over the whole boron film and has a close side and a far side opposite each other,a hermetic seal between and adjacent to an outer ring of the adjacent side of the boron film and the top of the support frame, the hermetic seal being a direct link between the boron film and the support frame and free from the aluminium film,where the aluminium film is adjacent to the adjacent side of the boron film within the outer ring,where ThF is the minimum thickness of all thin films exceeding the opening, Th12 is the minimum thickness of the boron film in the opening and Th52 is the minimum thickness of the aluminium film in the opening; anda ring film adjacent to the underside of the support frame, with an aperture oriented towards the opening of the support frame and over the entire ring film `90 percentage boron'.
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