X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 17
In the expression for Wn we take radius of the
monocapillary instead of polycapillary entrance flare. Even when the area of flare is
greater than the area of monocapillary entrance, X-rays pass only in the diameter of a
monocapillary and radiation with greater angles will be reflected from wall.