Andrew Robinson and Ian Dulgarn talk to us about the roles of a physicist and radiotherapy technician, and the importance of these positions in our Radiotherapy Department. The Radiotherapy Physics Department at Addenbrooke's Hospital in Cambridge, UK, plays a vital role in ensuring the safety and accuracy of radiotherapy treatment, and makes sure that the radiation is delivered exactly as planned. Our physicists and technicians work closely together, knowing the precise working of our machines – linear accelerators, or LINAC for short.