Abstract
Abstract Recently a remarkable progress has been made in fast ADCs such as flash ADCs. This paper shows a method of applying these fast ADCs to the radiation measurements. Direct sampling and digitizing of output signal from preamplifier were examined using the weighted sum of sampled data in order to obtain the energy of incident radiations. As a result, this method is applied to r-ray spectroscopy by a Nal(Tl) scintillation counter to give sufficient performance. Because the present method treats the signal waveform itself, the standard waveform of input signals can be measured. After the standard waveform was obtained by preliminary measurement, a trial was made to select the similar waveforms to the standard waveform using the resembrance factor. With this selection, improvement of energy resolution was observed in the measurement of 60Co γ-ray.
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