الملخص

Abstract The importance of this study is encountered in the fact that there is no lower limit for The dangerosity of radiation . The problem arises especially after the arrival of a number of visible devices with lower international standards Thermo luminescence Dosimeter.(TLD) and x-ray film were used to study the effect of geometrical shapes of the screens of these devices working with (20-40kV)on the amount of change in radiation dose emitted from these screens.