Jisho

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比例計数管
Wikipedia definition
1. Proportional counterA proportional counter is a measurement device to count particles of ionizing radiation and measure their energy. A proportional counter is a type of gaseous ionization detector. Its operation is similar to that of a Geiger-Müller counter, but uses a lower operating voltage. An inert gas is used to fill the tube, with a quench gas added to ensure each pulse discharge terminates. A common proportional gas mixture is 90% argon, 10% methane, known as P-10.
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