Enhancement of the UK Primary Standard for Absorbed Dose for Proton Radiotherapy

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The proposal is to combine the NPL Graphite Calorimeter, which defines the UK standard for absorbed dose in proton radiotherapy but has no position sensitivity, with radiation-hard position sensing tracking detectors from particle physics. These will accurately map the profile of the dose distribution on the front of the NPL calorimeter to provide a new instrument which, for spot scanning proton radiotherapy, provides both the delivered dose and the dose beam-spot profile and monitors this as a function of time.