Heidelberg 2006 – scientific programme

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ST: Strahlen- und Medizinphysik

ST 7: Strahlentherapie mit schnellen Ionen II

ST 7.7: Talk

Tuesday, March 14, 2006, 12:30–12:40, D

Synthetic diamonds for heavy-ion therapy dosimetry — •Monika Rebisz, Eleni Berdermann, Andreas Heinz, Michał Pomorski, and Bernd Voss — Gesellschaft für Schwerionenforschung mbH, Planckstraße 1, D-64291 Darmstadt, Germany

In this paper we report on results obtained using Chemical-Vapor-Deposition (CVD) diamond detectors irradiated with heavily ionizing particles. At the heavy-ion therapy facility of GSI Darmstadt, the carbon pencil beam with spot sizes between 4 to 10 mm (FWHM), and fluencies of 10E6-10E8 ions/second were used. For initial energies from 80 up to 430 MeV/u the detectors were operated in transmission mode. Experiments at the UNILAC facility of GSI were carried out with ions from 12C up to 238U, fluencies between 10E4 and 10E5 ions/second/mm2 and a maximum size of the beam of 45 mm in diameter. With initial energies of 11.4 MeV/u the particles were stopped in the active detector volume. Two types of electronics were used to process the signals obtained from the diamonds. Fast amplifiers with a bandwidth of 2.2 GHz and 50 Ω impedance together with a 300 MHz Phillips discriminator served to count the number of impinging particles. Alternatively, an electronic based on a specially designed ASIC integrated the current signals from the detectors.

The Thermoluminescence (TL) response of synthetic-diamond dosimeters to heavily ionizing particles has also been studied. A discussion of the results from the passive radiation-detection and dose verification is given.