1. A device for charged hadron therapy verification by detecting and/or quantifying prompt gammas produced when irradiating an object or a body with a charged hadron beam, said device comprising a gamma-ray pin-hole camera arranged to acquire a number of said prompt gammas emitted while the charged hadron beam is penetrating the object or body, wherein the pinhole camera comprises at least one scintillating crystal optically coupled to a plurality of photomultiplier tubes which form a linear or two-dimensional array, and wherein said pin-hole camera comprises a pinhole collimator made of a high atomic number material and having a conically shaped hole enabling detection of prompt gammas that are not emitted from 90° of the beam direction.