Cancer cells, unlike normal healthy cells, have a reduced ability to repair damage from superficial electron therapy. The electron beam is created by a computer-controlled medical linear accelerator that produces a pure therapy beam that is customized to the cancer site. Unlike older technologies that use penetrating X-rays or strong, high-dose radioactive sources, the electron beam system used at ForCare Medical Center protects healthy tissues. It works by delivering a series of small electron beam treatments to the cancer site that destroys cancer cells but allows healthy cells to heal.