  We have demonstrated that GaN Schottky diodes can be used for high energy
(64.8 MeV) proton detection. Such proton beams are used for tumor treatment,
for which accurate and radiation resistant detectors are needed. Schottky
diodes have been measured to be highly sensitive to protons, to have a linear
response with beam intensity and fast enough for the application. Some
photoconductive gain was found in the diode leading to a good compromise
between responsivity and response time. The imaging capability of GaN diodes in
proton detection is also demonstrated.
