München 2004 – scientific programme
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ST: Strahlenphysik und Strahlenwirkung
ST 5: Strahlenwirkungen - Strahlentherapie I
ST 5.3: Invited Talk
Thursday, March 25, 2004, 12:00–12:30, HS 129
High resolution heavy ion track structure imaging — •Gabor Laczko1, Volker Dangendorf1, Michael Kraemer2, Dieter Schardt2, and Kai Tittelmeier1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany — 2Gesellschaft fuer Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
The difference in the relative biological efficiency (RBE) of ions of same linear energy transfer (LET) but different atomic number (Z) can be attributed to the difference in the local ionisation distribution which can be expressed by its radial ionisation distribution. We have started an experimental programme at GSI to study the track structure of ions of various Z but similar LET. The experimental system is based on a time projection chamber with a parallel drift field, parallel-plate charge and light amplification stages and optical readout with an intensified CCD camera (Optical Avalanche Chamber, OPAC). The chamber is operated with low pressure gas (4 to 40 hPa) to achieve a resolution of down to a few tens of nm scaled to tissue density. The resolution is mainly limited by the electron diffusion in the chamber. We present first results and a comparison of these measurements with corresponding track structure properties obtained by Monte Carlo simulations of Kraemer and Grosswendt.