| 摘要 |
PURPOSE: To provide a positron detection apparatus by which the radioactivity of a positron nuclide can be measured precisely regarding a sample containing a disturbing nuclide and which can cover a wide measuring range. CONSTITUTION: A positron detection apparatus comprises two detection parts, i.e., a first detection part up to a simultaneous counting circuit 16 from scintillation detectors 10a, 10b and a second detection part up to a simultaneous counting circuit 26 from scintillation detectors 20a, 20b. In the respective detection parts, detection signals of the opposite scintillation detectors as one pair are counted simultaneously by the simultaneous counting circuit 16 or 26, and only pulses which are caused by a positron nuclide can be extracted. Since the volume of a scintillator part is different from each other in the respective detection parts, the detection efficiency of the respective detection parts is different from each other. Consequently, when the radioactivity of a sample exceeds the detection limit of every detection part having a large volume, the measured value of every detection part having a small volume is adopted. Thereby, a measured value whose accuracy is high over a wide measuring range can be obtained.
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