Implications of X-ray beam profiles on qualitative and quantitative synchrotron micro-focus X-ray fluorescence microscopy. - Morrell AP; Mosselmans JFW; Geraki K; Ignatyev K; Castillo-Michel H; Monksfield P; Warfield AT; Febbraio M; Roberts HM; Addison O; Martin RA (Journal of synchrotron radiation, 2018)