LET effects on the hydrogen production induced by the radiolysis of pure water

Autor: J. Barbet, Massoud Fattahi, Rachid Essehli, G. Blain, Francis Crumière, Johan Vandenborre
Přispěvatelé: Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Cyclotron ARRONAX
Rok vydání: 2013
Předmět:
Zdroj: Radiation Physics and Chemistry
Radiation Physics and Chemistry, Elsevier, 2013, 82, pp.74-79. ⟨10.1016/j.radphyschem.2012.07.010⟩
ISSN: 0969-806X
DOI: 10.1016/j.radphyschem.2012.07.010
Popis: Radiation chemical primary yields g(H 2 ) have been determined for irradiations performed with 60 Co γ-rays source of LCP (Orsay, France) and with helium ion beams ( E α =5.0 MeV–64.7 MeV) using protective agent bromide anions in solution. The α ( 4 He 2+ ) irradiation experiments were performed either at CEMHTI or at the new ARRONAX cyclotron facility (2010). Both sources (γ and cyclotrons) allow working with a large LET value range between 0.23 and 151.5 keV/μm. On one hand, the obtained results have been compared with those available in the literature and plotted as a function of the LET parameter in order to discuss the effects of track structure on the production of molecular hydrogen. On the other hand, the primary radiation chemistry yield g(H 2 ) values are compared with global radiation chemical yields G(H 2 ) obtained during irradiations of pure water irradiated under air or argon without scavenging. For each system, it appears that radiation chemical yields increase with the LET value. Our results suggest that using bromide anions, at low concentration, as a protective agent becomes ineffective when the LET value used is higher than 120±20 keV/μm.
Databáze: OpenAIRE
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