| 摘要 |
PURPOSE:To permit simple and accurate adjustment of the uniformity at the determination of nonlinear parameters and automate the adjustment by removing the signal components below set levels from the detection signals of photoelectric multipliers. CONSTITUTION:The radiations from the radioactive isotopes in a specimen are detected by plural photoelectric multipliers 3 via a scintillator 1 and a light guide 2, and the detected signals are supplied via a parameter identifying jig 8 to a multichannel analyzer 10 consisting of a resistance matrix system position calculation circuit. The position calculated data are fed to a CPU11. In the CPU11, the incident position of radiations to the scintillator 1 is determined, and the distribution information of radioactive isotopes is obtained. In this case, an impedance conversion circuit EF1 is provided between a threshold circuit TH for removing the signal components below set levels and a circuit NL for the purpose of non-linear correction within the waveform shaping circuit of the jig 9, whereby the responses of the respective parameters are averaged.
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