CRYSTALLINE SCINTILLATOR CONSISTING OF RARE EARTH HALOGENIDE, WITH A POLISHED REACTIVE FACE

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The invention relates to a monocrystalline scintillator material comprising at least 50 mass % of rare earth halogenide and a first polished face. Said material is incorporated into an ionising radiation detector comprising a photoreceiver that is optically coupled to the material by a face different from the first polished face. The material provides a good energy resolution and a strong light intensity. The polishing can be carried out irrespective of the crystalline orientation of the crystal. The loss of material as a result of the orientation is therefore eliminated.