For Mossbauer y-rays in the "in-beam" Mossbauer experiments using various beams such as heavy ion, secondary short-lived isotope, and neutron beams, it isnmportant to develop a detector. A parallel-plate avalanche counter (PPAC) is the most suitable gas counter for on-line measurements, because PPAC collects the internal conversion electrons emitted by the Mossbauer effect even under high y-background. We evaluated the influences of the pressure and flow rate of the counter gas against the counting efficiency of PPAC, and determined the optimum conditions for use in the in-beam Mossbauer experiments.
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