Detectors for in vivo range and dose verification in proton therapy

Particle detection instrumentation to address the in vivo verifications of proton dose and range is under development as part of a proton therapy research program focused on patient quality assurance. For in vivo proton range verification, a collimated gamma detector array is under construction to indirectly measure the position of the Bragg peak for each proton beam spot to within 1–2 mm precision. For dose flux verification, a proton fluence detector based on the technology of the Micromegas is under construction. This detector has an active area of about 100 cm 2 , coordinate resolution of better than 1 mm, and handling of incident proton beam fluxes of 10 9 –10 13 particles/s.