Conveners
Work Package 2
- Peter Peier (METAS)
Using the two reference UHPDR electron beams characterised at the PTB facility, it was possible to perform the characterisation of Alanine/ESR secondary standard dosimetry system and to conclude that no dose rate dependency of the response occurs in a dose per pulse range between 0.1 Gy to 6 Gy per pulse. The second secondary standard to be tested was commercially available ionisation...
This contribution contains a review and outlook on the work with diamond detectors, which was carried out in the framework of the UHDpulse project. Using the commercially available microDiamond detector and modifications, the critical parameters for linearity under ultra-high dose per pulse conditions were determined and optimized. The optimized detector - flashDiamond - was validated on four...
A review on the use of diamond-based detector for time-resolved measurements under UH-DR and UH-DPP beams will be presented. In particular, the microDiamond and the flashDiamond detectors were utilized for dose and instantaneous dose rate measurements in UH-DR scanned ion beams and UH-DPP electron beams. The developed dosimetric systems were found to be suitable tools for the acquisition of...
A detailed numerical simulation of the charge carrier transport inside a parallel plate ionization chamber (PPIC) was developed in UHDPulse. This methodology allows the study of the contributions of ion-ion, electron-ion, electric field perturbation, beam time structure and influence magnitudes to the recombination effect [1,2].
The simulation has been commissioned against an extensive...
The code of practice (TRS398 and TG51) for the determination of the absorbed dose to water recommend the use of the two-voltage method (TVM) for the calculation of the ion recombination correction factor, which is based on the early Boag theory and do not take into account the contribution of free electrons to the ionization chamber signal. Later, Boag and contemporaries developed three...
High dose-rate radiotherapy has been shown to increase the differential response between healthy and tumour tissue. Moreover, Very High Energy Electrons (VHEEs) provide more favourable dose distributions than conventional radiotherapy electron and photon beams. Plane-parallel ionisation chambers are the recommended secondary standard systems for clinical reference dosimetry of electrons,...
