ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY
Radiotherapy calibration. Scientist setting up equipment used to calibrate radiotherapy machines across the UK. This is a linear accelerator (linac). It is able to emit different types and strengths of radiation. It is focused on an instrument (box) that measures the amount of emitted radiation absorbed. This is equivalent to the dose absorbed by a patient. Data from these tests are used to calibrate the instruments that hospitals use to measure doses prior to treatment. Photographed at the National Physical Laboratory, Teddington, UK.
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