The W values for photons and electrons in mixtures of argon and alkanes

The mean energy required to form an ion pair for 5.89-keV 55Fe and 1.49-keV Al photons in mixtures of argon-methane and argon-butane gas was measured using the proportional-counter technique. The measured W values in the mixtures are lower than what is expected for regular mixtures, i.e., mixtures w...

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Bibliographic Details
Published inRadiation research Vol. 125; no. 1; p. 1
Main Authors Krajcar Bronić, I, Srdoc, D, Obelić, B
Format Journal Article
LanguageEnglish
Published United States 01.01.1991
Subjects
Argon
Butanes
Electrons
Ions
Methane
Radiation
Radiometry - instrumentation
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Summary:The mean energy required to form an ion pair for 5.89-keV 55Fe and 1.49-keV Al photons in mixtures of argon-methane and argon-butane gas was measured using the proportional-counter technique. The measured W values in the mixtures are lower than what is expected for regular mixtures, i.e., mixtures without an appreciable intermolecular energy transfer between the mixture components. The additional ionization yield through the nonmetastable Penning processes reaches a maximum abruptly at very low partial pressure of polyatomic admixtures (alkanes), decreasing steadily with higher admixture partial pressure.
ISSN:0033-7587
DOI:10.2307/3577974