| 摘要 |
PURPOSE:To suppress cross talk of radiation until it enters an electron multiplying element in a first stage, by providing an optical fiber plate in close contact with one side of a scintillator array and by providing a plurality of microlens arrays on the other surface of this plate so that they correspond to a plurality of scintillators. CONSTITUTION:When radiation enters a scintillator 1, light is emitted inside of it and part of the light enters an optical fiber plate 31. In other words, only the light of a component being parallel to the optical axis of each core of the plate 31 is led to the direction of a photomultiplier tube 2. The light emitted from the plate 31 is condensed by a microlens 32, passes through a light-sensing surface plate 25 and enters a photoelectric surface 21. A photoelectron released from the photoelectric surface 21 is multiplied sequentially by an electron multiplier 22 and enters a corresponding anode 23. By providing the scintillator 1, the lens 32, a multiplying stage of each element of the multiplier 22 so that they correspond to the anode 23, in this way, cross talk is suppressed.
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