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Geiger-Müller – Counting Efficiency

since only a single ion pair is required, secondary electron need only barely emerge from the wall near the end of its track in order to generate a pulse from a Geiger tube

efficiency for counting gamma rays therefore depends on:

probability that incident gamma ray interacts in the wall and produces a secondary electron

probability that secondary electron reaches the fill gas before the end of its track

only innermost layer o the wall near the gas may contribute secondary electrons

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