The presurmptions taken into consideration in preparing a quality control system for X ray diagnostics in Poland are presented. Despite a relatively high number of examinations (i.e. 715 per 1000 inhabitants in 1995) in Poland, a national system of patient dose reduction does not yet operte. Before the introduction of such a system some investigations were needed to analyse the current situation. The results of measurements of a number of physical parameters for different tyupes of X ray units are presented, together with a collection of data concerning the entrance dose to adult patients in conventional examinations (i.e. radiographs of the chest, spine and abdomen).
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