X ray detection system

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X-ray detector arrangement comprises a low energy detector (5) formed as detector material (8) for a scintillator containing an element with atomic number 30-40; and a high energy detector (6) with detector material (9) made of a ceramic scintillator containing an element with atomic number of more than 60. Preferred Features : The scintillator of the low energy detector is a single crystal. The detector material of the low energy detector is made of zinc selenide doped with tellurium and has a thickness of 0.2-1.0 mm. The detector material of the high energy detector is made of ceramic gadolinium oxysulfide doped with a rare earth element.