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Conception of a Tissue Equivalent Plastic Dosimeter Using Scintillating Fibres for Hadronic Therapy and Space Radiation Effects Studies
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Orientador(es)
Resumo(s)
Radiotherapy, and more specifically, proton therapy, presents a state-of-the-art treatment
for many types of cancer. Although this relatively new approach to cancer treatment
is enticing, it needs to be carefully monitored as it can result in unwanted severe sideeffects.
The control of the treatment depends on test phases, namely to determine the
dose to be deposited at the site, as well as on equipment that monitors the particle beam
during treatment, a beam profile monitor, which verifies the stability of the intensity and
position of the beam, its range and its straggling effect. This work proposes using scintillating
fibres in the assembly of an equipment that allows measurements both for dose
determination, as well as for beam monitor profile aplications. Plastic fibres in dosimetry
present many advantages such as that gas is not required, the scintillation decay time
is typically on the order of a few nanoseconds, the tissue equivalent characteristics of
plastic, the spatial granularity is proportional to the fibre diameter and the signal amplitude
is proportional to the deposited energy in the fibres. Though this linearity does not
happen near the Bragg peak due to quenching, a typical effect in scintillating materials.
Another issue is the crosstalk effect between adjacent fibres.
Therefore this work is the beginning of a characterization study to learn about the
fibre’s properties and evaluate their use in detectors for hadronic therapy and space effects
studies. Given the complexity of the problem few results were obtained, nevertheless
several iteration of Monte Carlo simulations are performed, we successfully measure
the attenuation coefficient of the fibres as we also create a tray in order to quantify the
crosstalk effect between adjacent fibres.
Descrição
Palavras-chave
Dosimetry Scintillating Fibers Detectors Radiotherapy