Progress on epitaxial GaAs detectors

We first show that GaAs is the material which should be used for X-ray medical imaging. Indeed, for materials characterized by larger atomic numbers, the requested spatial resolution will not be sufficient owing to the energy of the fluorescence photon which becomes too high. We then describe the performances we obtained with detectors made of thick epitaxial GaAs layers in medical conditions, in order to illustrate that such detector qualify for medical imaging