ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Linear accelerator. Varian linear accelerator showing the back of the machine (right) and the head (lower left), which is upside down and has had the lead shielding removed for servicing. Linear accelerators are used in radiotherapy as a source of high-voltage X-rays, which can deliver a precisely targeted dose of radiation to treat some cancers. This treatment is often combined with surgery or chemotherapy (drug treatment). Photographed at the Edinburgh Cancer Centre, UK.
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