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

Cristina R. Nascimento; Viviane K. Asfora; Vinicius R. M. Barros; Josemary A. C. Gonçalves; Luiza F. R. Andrade; Helen J. Khoury; Carmen C. Bueno

doi:10.15392/bjrs.v7i2A.577

Authors

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

Keywords:

Electron dosimetry, Si photodiodes dosimeters, Solid-state dosimetry

Abstract

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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Author Biographies

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

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