| 摘要 |
PROBLEM TO BE SOLVED: To permit pulse height discrimination of anα-ray, while utilizing the handiness of a ZnS(Ag) scintillation detector, thereby reducing the effects of natural radioactive nuclear species, so that efficient and smooth pollution management can be performed. SOLUTION: The detector is provided with a layer of a ZnS(Ag) scintillator 22 stimulated by the incidentα-ray to emit scintillator light, a photomultiplier tube 16 for transducing the scintillator light into an electrical signal, and a counting rate meter 34 counting the acquired pulse signal. The thickness of the layer of the scintillator is equal to or larger than the range of theα-ray from theα-ray radiation nuclear species to be separated. The thickness is made so that all the absorption of theα-ray energy occurs in the scintillator layer, and that the shielding of the generated scintillator light due to the scintillator itself is negligible. A pulse height discrimination circuit 32 is provided at the front stage of the counting rate meter. COPYRIGHT: (C)2006,JPO&NCIPI
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