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Quantitative measurement of partial pressures in halogen-quenched Geiger-Müller counters

Authors
Journal
Vacuum
0042-207X
Publisher
Elsevier
Publication Date
Volume
39
Identifiers
DOI: 10.1016/0042-207x(89)90043-2

Abstract

Abstract Discharge mechanisms and characteristic parameters of halogen-quenched GM counters are extensively dependent on the composition of the fill gas. To determine the partial pressures of the different gas species present in the counter's filling mixture, a sampling device with a molecular leak and a QMS was used. Molecular flow was tested and the system was calibrated using N 2Ar and N 2-Ne mixtures. Fragmentation factors and relative sensitivities were determined for argon and neon. In the presence of chlorine, HCI was detected systematically. Fragmentation factors for Cl 2 and HCl could be determined but not the system's relative sensitivity for chlorine. The origin of HCI is discussed on the basis of the data collected.

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