<prompt> Screen used for X-ray exposure prevention, is made of-LeadTungstenManganeseTitanium  <response>: Ans. is a i.e., Lead In x-ray facilities, walls surrounding the room with the x-ray generator may contain lead sheets, or the plaster may contain barium sulfate. Operators view the target through a leaded glass screen, or if they must remain in the same room as the target, wear lead aprons. Lead is the most common agent used in modern constructions Room design to offer radiation shielding.Other Important facts about x-ray radiography Filament cathode and Target anode are made of Tungsten. However, In mammography the target anode is made of Molybdenum or rhodium. Most of the modern x-ray tubes have rotating anode because rotating anode have better heat dissipiation. The x-ray tube uses all three forms of cooling i.e., radiation, conduction and convection. However, radiation is most important. X-ray grid is the part of x-ray machine that ensures the clarity of image on x-ray film, absorbs scattered x-rays and filters out radiations. Filter is the device which absorbs low energy photons and there by decreases the radiation exposure to the patient. Filter is usually made of aluminium or aluminium copper combination. Window is the part of x-ray machine through which the x-ray beam is emitted towards the patient. Collimators are used to restrict the size of the x-ray beam, i.e., restriction of field size and decreases scatter radiation. Film focus distance the distance from x-ray tube target, i.e., anode to the x-ray film is 100 cms 40 inches for routine radiography. While for chest x-ray it is 180 cm 72 inches or 6 feet to reduce magnification as short distance increases the magnification of body part. 