Pregled bibliografske jedinice broj: 74450
Operation of low-pressure proportional counter filled with argon-based gas mixtures
Operation of low-pressure proportional counter filled with argon-based gas mixtures // Strahlenschutz fuer Mensch und Gesellschaft im Europa von Morgen, ISSN 1013-4506 / Mueck, K; Hefner, A; Vana, N (ur.).
Gmunden, 2001. str. 62-65 (poster, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
Operation of low-pressure proportional counter filled with argon-based gas mixtures
Autori
Krajcar Bronić, Ines ; Grosswendt, Bernd
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Strahlenschutz fuer Mensch und Gesellschaft im Europa von Morgen, ISSN 1013-4506
/ Mueck, K; Hefner, A; Vana, N - Gmunden, 2001, 62-65
Skup
Gemeinsame Tagung des ÖVS und FS: Strahlenschutz fuer Mensch und Gesellschaft im Europa von Morgen
Mjesto i datum
Gmunden, Austrija, 17.09.2001. - 21.09.2001
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
proportional counter; gas mixtures; gas gain; ionization coefficient
Sažetak
Mixtures of argon with propane, DME (Dimethyl-ether) and isobutane at total pressures P from 2 kPa to 90 kPa were studied in a low-pressure proportional counter. Strong non-uniform electric fields were thus produced at the anode surface (Sa). Deviations from the exponential dependence of gas gain on high voltage above a certain value of gas gain, M0, were observed in all mixtures. The best energy resolution has been obtained at low gas gains, and at gas gains above M0 resolution degrades much faster in "thin" mixtures due to avalanche chain formation. The reduced ionization coefficient a/P under non-equilibrium conditions is a function of mixture composition and of gas pressure. Crossings of a/P curves for different mixture compositions at the same total pressure are observed. The statistics of the avalanche size distribution (relative variance f) was determined by measuring the single-electron (SE) spectra. In pure gases and in mixtures with relatively high content of the molecular gas, the value is f < 1 (peaked distribution). In "thin" mixtures the SE spectra change the shape toward the over-exponential distribution, f > 1. The gas gain where f ~ 1 is roughly equal to the value of M0, showing that both effects are caused by insufficient quenching of the molecular admixture.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
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