title: Verification of absorbed dose rates in reference beta radiation fields: Measurements with an extrapolation chamber and radiochromic film.
abstract: Beta Secondary Standard 2 (BSS 2) provides beta radiation fields with certified values of absorbed dose to tissue and the derived operational radiation protection quantities. As part of the quality assurance, the reliability of the CDTN BSS2 system was verified through measurements in the90Sr/90Y and85Kr beta radiation fields. Absorbed dose rates and their angular variation were measured with a 23392 model PTW extrapolation chamber and with Gafchromic radiochromic films on a PMMA slab phantom. The feasibility of using both methods was analyzed.
authors.affiliation: Centro de Desenvolvimento da Tecnologia Nuclear, CDTN. Av. Presidente Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: S R
authors.initials: SR
authors.lastname: Reynaldo
authors.affiliation: Centro de Desenvolvimento da Tecnologia Nuclear, CDTN. Av. Presidente Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: J A
authors.initials: JA
authors.lastname: Benavente
authors.affiliation: Centro de Desenvolvimento da Tecnologia Nuclear, CDTN. Av. Presidente Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil. Electronic address: silvata@cdtn.br.
authors.forename: T A
authors.initials: TA
authors.lastname: Da Silva
keywords: Absorbed dose rate measurements; Beta secondary standard; Extrapolation chamber; Radiochromic film