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Geiger-Müller – Counting Efficiency

probability of gamma-ray interaction increases with atomic number of the wall

gamma-ray efficiency of Geiger tubes is highest for those tubes constructed with a cathode wall on high-Z material

G-M tubes with bismuth (Z = 83) cathodes have been widely used in the past

probability of interaction within the sensitive layer remains small even for high-Z materials

typical gamma-ray counting efficiencies are seldom higher than several percent

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