The performance of a multi guard ring (MGR) diode for clinical electron beams dosimetry

C R Nascimento; V K Asfora; J A C Gonçalves; H J Khoury; V S M Barros; L F Kalil; C C Bueno

doi:10.1016/j.apradiso.2018.07.002

The performance of a multi guard ring (MGR) diode for clinical electron beams dosimetry

Appl Radiat Isot. 2018 Nov:141:112-117. doi: 10.1016/j.apradiso.2018.07.002. Epub 2018 Jul 3.

Authors

C R Nascimento¹, V K Asfora², J A C Gonçalves³, H J Khoury⁴, V S M Barros², L F Kalil⁵, C C Bueno³

Affiliations

¹ Departamento de Energia Nuclear- UFPE, Av. Prof. Luiz Freire, 1000, 50740-545, Cidade Universitária, Recife, PE, Brazil; Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco - IFPE, Recife, PE, Brazil.
² Departamento de Energia Nuclear- UFPE, Av. Prof. Luiz Freire, 1000, 50740-545, Cidade Universitária, Recife, PE, Brazil.
³ Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP, São Paulo, SP, Brazil.
⁴ Departamento de Energia Nuclear- UFPE, Av. Prof. Luiz Freire, 1000, 50740-545, Cidade Universitária, Recife, PE, Brazil. Electronic address: hjkhoury@gmail.com.
⁵ Liga Norte-Rio-Grandense Contra o Câncer - CECAN, Natal, RN, Brazil.

PMID: 30212784
DOI: 10.1016/j.apradiso.2018.07.002

Abstract

The dosimetric response of a multi guard ring structure (MGR) diode has been studied with clinical electron beam energies from 5 MeV to 15 MeV. The results showed that the MGR dose response is linear in the range of 5-320 cGy and presents reproducibility with variation coefficients less than 0.4%. The field output factors measured with the MGR agreed within 2% with those measured with an ionization chamber. This study evidences that this diode can be used for clinical electron beam dosimetry.

Keywords: Clinical electron beam dosimetry; Radiation hard diode; Semiconductor dosimeter.