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Utilização de fototransistor SMT na medida de alguns parâmetros dosimétricos em radioterapia convencional

2008; Associação Sergipana de Ciências; Volume: 4; Issue: 11 Linguagem: Inglês

1808-2793

J. O. da Silva, C. M. S. de Magalhães, João Antônio Filho, Luiz A. P. Santos, W. M. Santos,

Radiation Effects in Electronics

For monitoring the delivered dose in the patient undergoing a cancer treatment with high-energy ionizing radiation beams is necessary to use appropriate dosimeters for the beam control quality and if it is possible, to obtain the dose information during the treatment. For this, semiconductor-based devices are used because of their high spatial resolution and to be easy to handle in spite of the ionization chambers. Nowadays the bipolar phototransistors are being proposed as ionizing radiation detectors for presented, beyond these characteristics, the signal amplification factor (gain). So, the aim of this work is to present the use of a dosimetric system using a SMT phototransistor in the measurement for some dosimetric parameters in conventional radiotherapy: the field factor and the off-axis ratio. The phototransistor’s readings were compared with ones obtained from a PTW 23343 Markus chamber, under the same conditions.