MARTIN DOHRN / SCIENCE PHOTO LIBRARY MARTIN DOHRN / SCIENCE PHOTO LIBRARY
Man undergoing radiation treatment (radiotherapy) for cancer of the spine. A cobalt source is being used, which delivers a finite, high-power dose to a localised area. The radioisotope used, cobalt- 60, is a powerful gamma-ray emitter. The radiation is aimed at the target area with the aid of red laser beams, visible across the patient's back.
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