Abstract
This paper presents the direct comparison between measurements and Monte Carlo ion chamber simulations employing the EGSnrc Monte Carlo code.
Surrounding metal caps for a 1 cm3 ionization chamber (PTW30015) were varied both, in measurements and simulations. Absorbing caps made of iron, copper and aluminum alloy were manufactured each with wall thickness between 2 and 30 mm. As a radiation source, a Siemens Gammatron S 60Co machine was used. Normalized dose values were compared and changes to the cross-sections used in the Monte Carlo simulations investigated.
Results agreed within the range of the measurement uncertainties of 0.5%. Still, variations in photon cross-sections lead to significant changes in the results, highlighting the need of accurate input data for this type of investigation.
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© 2009 Springer-Verlag Berlin Heidelberg
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Toussaint, A., Wulff, J., Zink, K. (2009). Measurements and EGSnrc Monte Carlo Simulations for Thimble Ion Chambers with Various Metal Caps at 60Co Beams. In: Dössel, O., Schlegel, W.C. (eds) World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany. IFMBE Proceedings, vol 25/3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03902-7_131
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DOI: https://doi.org/10.1007/978-3-642-03902-7_131
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03901-0
Online ISBN: 978-3-642-03902-7
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