For many years, CEA has been involved in the development of semiconductor-based X-ray and gamma-ray spectrometric imagers (20keV-1MeV). The main applications targeted are medical imaging, nuclear, security and astronomical observations. State of the art detectors based on Cadmium Telluride single crystals (Cd(Zn)Te) are efficient but costly and their detection area is limited. In recent years, halide perovskites have proven to be promising alternatives. The energy resolution of single pixel detectors made with these crystals proved to be in line with that of CdTe based detectors. However, to this day, the performances of perovskite single crystals as application specific spectroscopic imagers have never been established. The objective of this 18-months project (PRISM) is to benchmark halide perovskite single crystals from different suppliers for X and gamma-ray spectro-imaging in key areas for CEA: astrophysics