Abstract
The photo-ionization proportional scintillation chamber, that couples a pure noble gas scintillation counter to a photo-ionizing gas multi-anode proportional chamber, allows both a very good energy resolution and an accurate space localization to be obtained of ionizing radiation. This paper describes a calculation, based on the known detector parameters and on the measured energy resolution, that allows the estimation of the scintillation efficiency in the secondary light emission process. For krypton the efficiency is estimated to be (97 ± 20)%, implying that most of the energy available from the external field is radiated by the electrons as secondary scintillation since kinetic energy losses are small. The relevance of such a result, especially when compared with the values obtained for xenon and argon, is also discussed.
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