Energy loss of protons and heavy ions in waterAim of the studyProtons and heavy ions (mostly 12C) are used in external beam radiotherapy. The aim is to measure the stopping power of water for protons and 12C in the low-energy regime (below 30 MeV/nucleon) where experimental stopping power data are not available. Experimental data are needed for reducing the uncertainties of the dose estimates. ImplementationDosimetry of protons and 12C beams rely on theoretical estimates on the stopping powers of water and air, since, to date, no experimental data are available. In this work a new measurement system, applicable for liquid targets and heavy ion beams, will be developed. The stopping powers of water for proton and 12C particle beams will be measured in the accelerator laboratory of University of Jyväskylä. Information and exploitation of the resultsThe results will be published in international journals. For successful treatments in radiotherapy, the knowledge of the absorbed dose to the tumour and to the surrounding tissues is of paramount importance. A small change in the absorbed dose to the tumour could lead to a significant change in the probability of cure. Dosimetry of proton and heavy ion exposure is also of importance in space missions and other branches of radiation dosimetry. CollaboratorsUniversity of Jyväskylä, Finland; JINR Dubna, Russia; Radium Institute, Russia; University of Lodz, Poland and Technical University Darmstadt, Germany Timetable2007-2010 Responsible scientistTeemu Siiskonen Page updated 17/05/2009
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