Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8173777 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2015 | 8 Pages |
Abstract
This work presents a thermoluminescence dosimetry based method for the measurement of bremsstrahlung spectra in the energy range from 30Â keV to 100Â MeV, resolved in ten different energy intervals and for the photon ambient dosimetry in ultrashort pulsed radiation fields as e.g. generated during operation of the PHELIX laser at the GSI Helmholtzzentrum für Schwerionenforschung. The method is a routine-oriented development by application of a multi-filter technique. The data analysis takes around 1Â h. The spectral information is obtained by the unfolding of the response of ten thermoluminescence dosimeters with absorbers of different materials and thicknesses arranged as a stack each with a different response function to photon radiation. These response functions were simulated by the use of the Monte Carlo code FLUKA. An algorithm was developed to unfold bremsstrahlung spectra from the readings of the ten dosimeters. The method has been validated by measurements at a clinical electron linear accelerator (6Â MV and 18Â MV bremsstrahlung). First measurements at the PHELIX laser system were carried out in December 2013 and January 2014. Spectra with photon energies up to 10Â MeV and mean energies up to 420Â keV were observed at laser-intensities around 1019W/cm2 on a titanium foil target. The measurement results imply that the steel walls of the target chamber might be an additional bright x-ray source.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Felix Horst, Georg Fehrenbacher, Torsten Radon, Ekaterina Kozlova, Olga Rosmej, Damian Czarnecki, Oliver Schrenk, Joachim Breckow, Klemens Zink,