ESTRO 2024 - Abstract Book

S3390

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Figure 1: Dose distribution measured with EBT3 films applying FLASH dose rates in the entrance channel extracting 5.3x108 carbon ions in 150 ms.

Figure 2: Dose profile in x- and y-axis applying FLASH and conventional dose rates analyzed with EBT3 films.

Conclusion:

We demonstrated that dose rates up to 230 Gy/s can be achieved at the synchrotron-based proton and carbon ion beamline at MIT without the need for significant modifications. However, in terms of the stability and accuracy for further experiments, a controlled extraction of the particles is indispensable, which is currently being implemented. Therefore, an external ionization chamber filled with helium gas is included for beam monitoring. This way, a scanned beam application will be possible to cover a larger area with a homogeneous dose distribution.