Patent ID: 6125165
Filing Date: 2000-09-26
Classification: G21K

Abstract:
A method for reducing, by a factor that is uniform to a desired degree for all energies in a selected energy range .DELTA.E, the flux of x-rays impinging on a selected area A from an x-ray source S, the method comprising:preventing said area A from being directly irradiated by said source S;placing a scattering body of x-ray scattering material between said source S and said area A so that only by scattering from said scattering body over an angular range R of scattering angles can x-rays from source S reach area A; andrestricting the angular range R to a limited range of small, forward scattering angles;wherein said scattering body is configured with a thickness L, the thickness L being measured in a direction parallel to an axis z running from the center of said source S to the center of said area A, the thickness L at a given position relative to said axis is a function of the given position, and said function is such that the scattering efficiency into said area A is uniform to the desired degree for all x-ray energies within said energy range .DELTA.E.