Provides an overview of the components of the linear accelerator and how they function and interrelate. Compares X-ray generators with linacs, runs through microwave power sources, and covers components such as the bending magnet, treatment head, retractable beam stopper, waveguide, and circulator. Appends a listing of representative linac treatment units by the major brand names in the industry. Annotation copyright by Book News, Inc. , Portland, OR