It’s the application of physics to medicine. Medical physicists work in medical imaging with ionising radiation (x-rays etc.), medical imaging with non-ionising radiation (mri and ultrasound), radiotherapy or radiation safety. A radiotherapy physicist for example will be involved in quality assurance (making sure the machines deliver the right dose to the patient), treatment planning (deciding how to use the radiation to deliver the dose prescribed by the doctor), research, teaching etc.
Nice question Phoebe- a lot of medical physics involves designing scanners to see inside the human body (to find tumours etc) and then designing treatments (e.g. Firing beams of light or protons at a tumour). Physics people understand how protons and light behave so it’s got to be medical physics 👍🏼
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