Gamma ray camera - for rendering gamma radiation images visible using a photo electric transducer and signal processing circuits

In a gamma ray camera for making gamma ray images visible with (a) a scintillation crystal, in which light flashes are produced by the incident gamma-quanta, and are converted into electric signals by a series of mutually displaced detectors and (b) a signal-processing device which produces locting signals from these electric signals cooresponding to the co-ordinates of the points of incidence of the gamma-quanta, the improvements whereby (c) the signal-processing device has a store in which at least one curve can be stored electrically and which reproduces the course of the brightness on the output side of the crystal in the region of a point of incidence in a co-ordinate direction (d) a displacer device is provided for the electrical displacement of the stored curves in relation to that of the brightness curve constituted by the detector output signals (e) the output signals of the detectors and of the stores are supplied to a comparator forming a signal corresp. to the magnitude of the displacement, which is necessary for the maximum coverage of the stored curved constituted by the detector output signals, thereby characterising the co-ordinate value of such point of incidence. The camera gives improved locating of the point of incidence.