[en] The photon energy dependence of LiF:Mg,Cu,P (produced in Poland) as compared to LiF:Mg,Ti,TLD-700 and CaF₂:Mn was measured using X rays and ⁶⁰Co and ¹³⁷Cs γ ray radiation in two Secondary Standard Dosimetric Laboratories. The reproducibility of the response of all dosimetric systems was also studied at the primary beam of a diagnostic X ray unit. LiF:Mg,Ti and TLD-700 have been used to measure patient doses during chest organ examinations in diagnostic radiology of children to analyse the dose estimations in radiation fields that were not well defined. (Author)