PROPORTIONAL COUNTERRadiation DetectorsSummaryProportional counters are summarized below.Proportional Counters SummaryWhen radiation enters a proportional counter, the detector gas, at the point ofincident radiation, becomes ionized.The detector voltage is set so that the electrons cause secondary ionizations asthey accelerate toward the electrode.The electrons produced from the secondary ionizations cause additionalionizations.This multiplication of electrons is called gas amplification.Varying the detector voltage within the proportional region increases or decreasesthe gas amplification factor.A quenching gas is added to give up electrons to the chamber gas so thatinaccuracies are NOT introduced due to ionizations caused by the positive ion.IC-06 Page 22 Rev. 0
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