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Chemical Dosimetry during Alpha Irradiation: A Specific System for UV-Vis <i>in Situ</i> Measurement

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Author(s): Guillaume Blain | Rachid Essehli | Massoud Fattahi | Cedric Costa | Johan Vandenborre | Francis Crumière

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 03;
Issue: 01;
Start page: 6;
Date: 2012;
Original page

Keywords: &lt | i&gt | in Situ&lt | /i&gt | UV-Vis Measurement | Chemical Dosimetry | High Energetic α Irradiation | Ferric Ion Radiolytic Yield

ABSTRACT
This paper is devoted to the study of the potentiality of the Fricke dosimeter for the characterization of the highly energetic (62.1 MeV) α particles beams generated by a new cyclotron facility, namely ARRONAX started in 2009. Such for this high energetic α beam, in situ dosimetry is performed in order to avoid radiation safety inconvenience and to earn run time of irradiation. Therefore, an in situ Fricke dosimetry protocol is developed and its reliability is checked by comparison with other experiments carried out by using the traditional method (ex situ Fricke dosimetry) within another cyclotron facility (CEMHTI) and by comparison with literature data. To author’s knowledge, it is the first time that Fricke dosimetry is performed during the α irradiation experiment. The results of these in situ dosimetry experiments show that the value of ferric ions radiolytic yield (G(Fe3+) = (11.7 ± 1.2) 10–7 mol?J–1) extrapolated from literature data can be used for this higher energy of α particles (Eα = 62.1 MeV).

Tango Jona
Tangokurs Rapperswil-Jona

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