Radiation Detectors GAS-FILLED DETECTORThe pulse height can be computed if the capacitance, detector characteristics, and radiation areknown. The capacitance is normally about 10-4 farads. The number of ionizing events may becalculated if the detector size and specific ionization, or range of the charged particle, are known.The only variable is the gas amplification factor that is dependent on applied voltage.SummaryThe operation of gas-filled detectors is summarized below.Gas-Filled Detectors SummaryThe central electrode, or anode, attracts and collects the electron of theion-pair.The chamber walls attract and collect the positive ion.When the applied voltage is high enough, the ion pairs initially formedaccelerate to a high enough velocity to cause secondary ionizations. Theresultant ions cause further ionizations. This multiplication of electronsis called gas amplification.Rev. 0 Page 13 IC-06
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