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Radiation Protection Dosimetry 2004 110(1-4):595-600; doi:10.1093/rpd/nch138
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Fast neutrons produced by nuclear fragmentation in treatment irradiations with 12C beam

Konstanze Gunzert-Marx*, Dieter Schardt and Reinhard S. Simon

Gesellschaft für Schwerionenforschung, Planckstraße 1, D-64291 Darmstadt, Germany

* Corresponding author: K.Gunzert{at}gsi.de

In the framework of the heavy-ion tumour therapy project at GSI we investigated the nuclear fragmentation of 200 AMeV carbon ions stopping in a 12.78-cm thick water absorber. Fast neutrons and charged particles emerging from the target were registered at forward angles between 0° and 30° with a {Delta}E-E-telescope consisting of an NE102 and a BaF2 scintillator. We obtained neutron energy spectra and angular distributions and derived the neutron yield in the energy range from 10 to 500 MeV in the forward hemisphere. In addition, we performed fragmentation measurements in actual patient treatment irradiations. The resulting angular distributions of neutrons and charged particles as well as their yields are similar to those obtained with the water absorber.


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