LRA 222 Final Study Guide

The most widely used support structure for the x-ray tube is the ______________. - Answer-ceiling support system Tube failure can occur from _______________. - Answer-long exposure times As an x-ray tube ages, the inside can become coated with tungsten, which can cause _____ in the tube. - Answer-arcing The negative side of the x-ray tube holds the ________. - Answer-filament The filament is made of __________. - Answer-Tungsten The effective focal spot size is _____________ the actual focal spot size. - Answer-smaller than The external structure of the x-ray tube includes the support structure, the protective housing, and the ___________. - Answer-glass envelope Thermionic emission at the filament creates a __________. - Answer-space charge The target of the rotating anode is usually coated with a ___________ alloy. - Answer-Tungsten What is the most common cause of tube failure? - Answer-Tungsten vaporization The filament in an x-ray tube is about _____ cm in length. - Answer-1-2 When electrons bombard the target, ____% of their kinetic energy is converted to heat. - Answer-99 When electrons bombard the target, ____% of their kinetic energy is converted to heat. - Answer-99 The rotating anode is turned by a ____________. - Answer-magnetic field The cathode side of the tube should be directed toward the _____ part of the patient. - Answer-thicker The most widely used support structure for the x-ray tube is the ______________. - Answer-ceiling support system