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[en] Checking the change of values of parameters like specific value of kerma, repeatability of expositions, linearity of exposition, stability of high voltage, time of exposition and HVL of X-ray machines that are in use in medical centres of Republic of Serbia give us an idea of comparing those values for two groups of X-ray machines. One is in use since 70's in last century and is still in use, and the other group is quite new, and is controlled for last 5 years. Checking the results of controlled parameters within those two groups of X-ray machines we can compare stability and quality of old and new machines, and the influence of 'aging' of machines to the quality and stability of measured parameters. Some of conclusions are that old machines are showing better stability and repeatability of values of measured parameters during the 'aging' than new machines.(author)
Source
Knezevic, Z.; Krajcar Bronic, I.; Majer, M. (eds.); 578 p; ISBN 978-953-96133-8-7; 
; 2013; p. 346-351; 9. Symposium of the Croatian Radiation Protection Association; Krk (Croatia); 10-12 Apr 2013; 3 refs., 3 tabs., 2 figs.
; 2013; p. 346-351; 9. Symposium of the Croatian Radiation Protection Association; Krk (Croatia); 10-12 Apr 2013; 3 refs., 3 tabs., 2 figs.