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Updated: Mar 24, 2026

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Verification of absorbed dose rates in reference beta radiation fields: Measurements with an extrapolation chamber
S R Reynaldo1, J A Benavente1, T A Da Silva1
1Centro de Desenvolvimento da Tecnologia Nuclear, CDTN. Av. Presidente Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.
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 the 90Sr/90Y and 85Kr 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.
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Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
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