Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry

Autores/as

  • Cristina R. Nascimento Universidade Federal de Pernambuco - UFPE; Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco – IFPE
  • Viviane K. Asfora Universidade Federal de Pernambuco - UFPE
  • Vinicius R. M. Barros Universidade Federal de Pernambuco - UFPE
  • Josemary A. C. Gonçalves Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
  • Luiza F. R. Andrade Santa Casa de Misericórdia de Itabuna
  • Helen J. Khoury Universidade Federal de Pernambuco - UFPE
  • Carmen C. Bueno Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

DOI:

https://doi.org/10.15392/bjrs.v7i2A.577

Palabras clave:

Electron dosimetry, Si photodiodes dosimeters, Solid-state dosimetry

Resumen

The response of the commercial XRA-24 PIN photodiode (5.76 mm2 active area) for clinical electron beam dosimetry covering the range of 8-12 MeV was investigated. Within this energy range, the charge generated in the diode’s sensitive volume is linearly dependent on the absorbed dose up to 320 cGy.  However, charge sensitivity coefficients evidenced that the dose response of the diode is slightly dependent on the electron beam energy. Indeed, the diode’s energy dependence was within 8.5% for 8-12MeV electron beams. On the other hand, it was also observed an excellent repeatability of these results with a variation coefficient (VC) lower than 0.4%, which is within the 1% tolerance limit recommended by the AAPM TG-62. Furthermore, the agreement between the percentage depth dose profiles (PDD) gathered with the diode and the ionization chamber allowed achieving the electron beam quality within 1% of that obtained with the ionization chamber. Based on these results, the photodiode XRA-24 can be a reliable and inexpensive alternative for electron beams dosimetry.

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Biografía del autor/a

  • Cristina R. Nascimento, Universidade Federal de Pernambuco - UFPE; Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco – IFPE
    Departamento de Energia Nuclear - UFPE
  • Viviane K. Asfora, Universidade Federal de Pernambuco - UFPE
    Departamento de Energia Nuclear
  • Vinicius R. M. Barros, Universidade Federal de Pernambuco - UFPE
    Departamento de Energia Nuclear
  • Josemary A. C. Gonçalves, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
    Centro de Tecnologia das Radiações
  • Helen J. Khoury, Universidade Federal de Pernambuco - UFPE
    Departamento de Energia Nuclear
  • Carmen C. Bueno, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
    Centro de Tecnologia das Radiações

Referencias

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Publicado

2019-02-07

Número

Vol. 7 Núm. 2A (Suppl.) (2019): ENAN 2017

Sección

The Meeting on Nuclear Applications (ENAN)

Licencia

Derechos de autor 2021 Brazilian Journal of Radiation Sciences (BJRS)

Creative Commons License

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Cómo citar

Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry. Brazilian Journal of Radiation Sciences (BJRS), Rio de Janeiro, Brazil, v. 7, n. 2A (Suppl.), 2019. DOI: 10.15392/bjrs.v7i2A.577. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/577. Acesso em: 17 jul. 2025.