caa a22 4500 397503938 CHVBK 20180308164539.0 cr unu---uuuuu 161202e19950801xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082792 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082792 The Backscattering of Low-Energy Protons in Gases of Importance for Ionisation Measurements [Elektronische Daten] [B. Grosswendt, G. Willems] For gases frequently employed in ionisation chambers and proportional counters, in the energy range between 1 keV and 100 keV, the backscattering of protons has been studied experimentally by using a plane parallel ionisation chamber and theoretically by performing Monte Carlo proton transport simulations. Three types of backscatter factors were investigated: (i) the backscatter factor with respect to the ionisation yield, (ii) the energy absorption, and (iii) the number of primary particle endpoints. Whereas the first of these backscatter factors could be determined experimentally, the latter two were calculated assuming first that the energy loss due to inelastic proton interactions can be handled in the framework of the continuous slowing down approximation, and secondly that the spatial distribution of all possible interaction events is exclusively determined by elastic scattering. A comparison of the calculated and experimental backscatter factors for nitrogen, carbon dioxide, methane, ethane, propane, butane, and two tissue-equivalent gases based on methane or propane confirms the validity of the concept, at least within the uncertainties of the experimental and theoretical data. Radiation Protection Dosimetry Grosswendt B. aut Willems G. aut Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 245-252 0144-8420 61:1-3<245 1995 61 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082792 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082792 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grosswendt B. aut NATIONALLICENCE 700 1- Willems G. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 245-252 0144-8420 61:1-3<245 1995 61 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford