Utilization of SMT phototransistor for measurement of dosimetric parameters in conventional radiotherapy

Authors

  • J. O. da Silva Departamento de Física, Universidade Federal Rural de Pernambuco
  • C. M. S. de Magalhães Departamento de Física, Universidade Federal de Sergipe e Laboratório de Instrumentação Nuclear, CRCN/CNEN
  • J. A. Filho Departamento de Energia Nuclear,Universidade Federal de Pernambuco
  • L. A. P. dos Santos Laboratório de Instrumentação Nuclear, CRCN/CNEN
  • W. M. Santos Serviço de Física Médica, Hospital Governador João Alves Filho

Keywords:

dosimetry, bipolar phototransistor, radiotherapy.

Abstract

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.

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How to Cite

da Silva, J. O., de Magalhães, C. M. S., Filho, J. A., dos Santos, L. A. P., & Santos, W. M. (2011). Utilization of SMT phototransistor for measurement of dosimetric parameters in conventional radiotherapy. Scientia Plena, 4(11). Retrieved from https://scientiaplena.org.br/sp/article/view/725

Issue

Vol. 4 No. 11 (2008): November/Novembro 2008

Section

Articles

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