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Development of a Standard Methodology for Online Dose Calculation in Air
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Resumo(s)
For all the applications of accelerators, it is extremely important to have a precise characterization of
the beam, which includes knowing precisely its intensity and energy. The aim of the present work is to
develop a methodology to measure the current of a proton beam in air during an irradiation. This work
is developed in collaboration with the Centre for Micro Analysis of Materials (CMAM), where protons
can be accelerated up to 10 MeV toward a line devoted to perform irradiations in air. Two methods to
measure the intensity of the proton beam during the irradiation are presented.
For the first method, the beam leaves the vacuum conditions and reaches the air through a window
made of Si3N4. The protons excite the electrons of the Silicon and X-rays are emitted, which can be
detected. The number of measured X-rays from the Silicon is proportional to the number of protons that
travelled through the Silicon film and can be used to calculate the proton current.
The second methodology is based on the generation of secondary electrons by a proton beam on a
dosimeter. This brand-new device was developed and designed in the framework of this thesis using
Monte Carlo simulations. It consists of a disk made of aluminium with empty spaces through which the
protons pass and irradiate the sample. The secondary electrons generate a current that can be measured
to characterize the proton beam. An assembly is required to rotate the disk, hold it and collect the charge.
The choice of the components took into account the specifications required.
These two methods are complementary and can also be used at other external beam irradiation setups.
Descrição
Tese de mestrado, Engenharia Física, 2022, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Medições dosimétricas Irradiação com protões Simulações Monte Carlo Teses de mestrado - 2022