| Zugriffsnummer | 14909 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Statistical fluctuations in gas amplification factor of a low-pressure proportional counter |
| Autor(in); Institution |
Krajcar Bronic, Ines; Ruder Boskovic Institute, Zagreb, CROATIA
Großwendt, Bernd; 6.002, Grundlagen der Dosimetrie, PTB-Braunschweig
|
| Quelle/Jahr | Radiation protection and health : IRPA Regional Congress on Radiation Protection in Central Europe ; Dubrovnik, Croatia, 20 - 25 May, 2001 ; proceedings:(2002), 8p-17, 1 - 8p-17, 6 |
| Herausgeber(in) |
Obelic, Bogomil
Ranogajec-Komor, M.aacute.ria
Miljanic, Saveta
Krajcar Bronic, Ines
|
| ISBN | 953-96133-3-7 |
| Verlag | Zagreb: Croatian Radiation Protection Association |
| Konferenzangaben | IRPA Regional Congress on Radiation Protection in Central Europe - Radiation protection and health, Zagreb, 20-25, May, 2001, Croatia |
| Zusammenfassung | The electron avalanche formation in low-pressure (2 kPa - 90 kPa) argon-based gas mixtures in strong non-uniform electric fields was studied by a proportional counter. Concentration of admixtures (propane, isobutane, DME) varied between 1 % and 80 %. The relative variance ƒ of the avalanche size distribution was determined by measuring single-electron (SE) spectra. In pure gases and in mixtures with high content of the admixture, the SE spectra had always a peaked distribution, ƒ<1, although f increased with M. In "thin" mixtures the SE spectra changed the shape to the over-exponential distribution, ƒ>1. The f value depended on the partial pressure p of the admixture. The gas gain where the SE spectra change their shape, ƒ≈1, is roughly equal to the gain Mo where over-exponential increase of gas gain started. Both effects in M and ƒ are caused by avalanche chain formation due to insufficient quenching of the admixture. Energy resolution above Mo in "thin" mixtures degraded very quickly. Partial pressure should be above ≈10 kPa to assure good quenching even at the highest gains obtained in the present experiment. |
Zitierung
Krajcar Bronic, I. & Großwendt, B. (2002). Statistical fluctuations in gas amplification factor of a low-pressure proportional counter. IRPA Regional Congress on Radiation Protection in Central Europe - Radiation protection and health, Zagreb, 20-25, May, 2001, Croatia.