Carla Spoelder shares behind the scenes of a day in her life as an MSc Radiobiology student at the Department of Oncology. Having completed the taught modules, Carla is working on her dissertation project which compares the biological impact of external beam radiotherapy (EBRT) versus targeted radionuclide therapy (TRT). Standard TRT treatment is typically given using a fixed activity protocol, rather than measuring the dose delivered to each organ specifically. Additionally, dosing models developed for EBRT are applied to TRT, despite major differences in the approaches. Therefore, Carla wants to understand if we are accurately estimating the biological effects of TRT.