Definition of X-ray equivalent energy spectrum by the subtraction method

Technique to reconstruct energy spectrum of X-ray radiation (initiating apparatus signal coinciding within the limits of measurement error with experimental one) at measurement conducted by filter technique, is described. The considered technique enables to determine minimal value of parameters necessary to describe energy spectrum. It may be useful when analyzing information contained in the experimental curve attenuation, especially in case of unadequacy or absence of a priori information on true spectrum. Criterion of choice of quantity and thickness of filters is suggested, as well