Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry
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2017
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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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.
Como referenciar
NASCIMENTO, CRISTINA R.; ASFORA, VIVIANE K.; BARROS, VINICIUS S.M.; GONÇALVES, JOSEMARY A.C.; ANDRADE, LUCAS F.R.; KHOURY, HELEN J.; BUENO, CARMEN C. Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/28234. Acesso em: 24 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.