Lightweight planar detector for objects contaminated with particle radiation

Scintillation detector for measuring radioactive particle radiation comprising:

• at least one planar detector element made from a scintillator material;
• said at least one planar detector element being provided with a light guide that is placed on at least one planar side of said element and in which each of two ends of said light guide are guided into an evaluation unit and which is configured as a wavelength shifting fibre;
• said evaluation unit comprising one or more photomultipliers and a logic unit to which the signals of said at least one photomultiplier are applied;
• and
• wherein the two ends of the light guide are respectively connected to one of a separate photomultiplier and a channel of a photomultiplier and the outputs of the photomultiplier(s) are connected to the logic unit which produces an output signal for a detector element when the signals are substantially simultaneously applied to the ends of the light guide of a detector.