Spread-out Bragg peak measurements using a compact quality assurance range calorimeter at the Clatterbridge cancer centre.

The superior dose conformity provided by proton therapy relative to conventional x-ray radiotherapy necessitates more rigorous quality assurance (QA) procedures to ensure optimal patient safety. Practically however, time-constraints prevent comprehensive measurements to be made of the proton range in water: a key parameter in ensuring accurate treatment delivery.A novel scintillator-based device for fast, accurate water-equivalent proton range QA measurements for ocular proton therapy is presented.