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Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation

Many of the moving components in accelerator and target environments require lubrication. Lubricants in such environments are exposed to high fluxes of secondary radiation, which originates from beam interactions with the target and from beam losses. The secondary radiation is a mix of components, w...

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Autores principales: Ferrari, Matteo, Zenoni, Aldo, Hartl, Monika, Lee, Yongjoong, Andrighetto, Alberto, Monetti, Alberto, Salvini, Andrea, Zelaschi, Fabio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6819864/
https://www.ncbi.nlm.nih.gov/pubmed/31687582
http://dx.doi.org/10.1016/j.heliyon.2019.e02489
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author Ferrari, Matteo
Zenoni, Aldo
Hartl, Monika
Lee, Yongjoong
Andrighetto, Alberto
Monetti, Alberto
Salvini, Andrea
Zelaschi, Fabio
author_facet Ferrari, Matteo
Zenoni, Aldo
Hartl, Monika
Lee, Yongjoong
Andrighetto, Alberto
Monetti, Alberto
Salvini, Andrea
Zelaschi, Fabio
author_sort Ferrari, Matteo
collection PubMed
description Many of the moving components in accelerator and target environments require lubrication. Lubricants in such environments are exposed to high fluxes of secondary radiation, which originates from beam interactions with the target and from beam losses. The secondary radiation is a mix of components, which can include significant fractions of neutrons. Lubricants are radiation-sensitive polymeric materials. The radiation-induced modifications of their structure reduce their service lifetime and impose additional facility maintenance, which is complicated by the environmental radioactivity. The study of the lubricants radiation resistance is therefore necessary for the construction of new generation accelerators and target systems. Nevertheless, data collected in mixed radiation fields are scarce. Nine commercial greases were irradiated at a TRIGA Mark II Research Reactor to serve for the construction of new accelerator projects like the European Spallation Source (ESS) at Lund (Sweden) and Selective Production of Exotic Species (SPES) at Legnaro, (Italy). Mixed neutron and gamma doses ranging from 0.1 MGy to 9.0 MGy were delivered to the greases. For an experimental quantification of their degradation, consistency was measured. Two of the greases remained stable, while the others became fluid. Post-irradiation examinations evidence the cleavage of the polymeric structure as the dominant radiation effect. Dose and fluence limits for the use of each product are presented. Apart from the scientific significance, the results represent an original and useful reference in selecting radiation resistant greases for accelerator and target applications.
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spelling pubmed-68198642019-11-04 Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation Ferrari, Matteo Zenoni, Aldo Hartl, Monika Lee, Yongjoong Andrighetto, Alberto Monetti, Alberto Salvini, Andrea Zelaschi, Fabio Heliyon Article Many of the moving components in accelerator and target environments require lubrication. Lubricants in such environments are exposed to high fluxes of secondary radiation, which originates from beam interactions with the target and from beam losses. The secondary radiation is a mix of components, which can include significant fractions of neutrons. Lubricants are radiation-sensitive polymeric materials. The radiation-induced modifications of their structure reduce their service lifetime and impose additional facility maintenance, which is complicated by the environmental radioactivity. The study of the lubricants radiation resistance is therefore necessary for the construction of new generation accelerators and target systems. Nevertheless, data collected in mixed radiation fields are scarce. Nine commercial greases were irradiated at a TRIGA Mark II Research Reactor to serve for the construction of new accelerator projects like the European Spallation Source (ESS) at Lund (Sweden) and Selective Production of Exotic Species (SPES) at Legnaro, (Italy). Mixed neutron and gamma doses ranging from 0.1 MGy to 9.0 MGy were delivered to the greases. For an experimental quantification of their degradation, consistency was measured. Two of the greases remained stable, while the others became fluid. Post-irradiation examinations evidence the cleavage of the polymeric structure as the dominant radiation effect. Dose and fluence limits for the use of each product are presented. Apart from the scientific significance, the results represent an original and useful reference in selecting radiation resistant greases for accelerator and target applications. Elsevier 2019-09-25 /pmc/articles/PMC6819864/ /pubmed/31687582 http://dx.doi.org/10.1016/j.heliyon.2019.e02489 Text en © 2019 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Ferrari, Matteo
Zenoni, Aldo
Hartl, Monika
Lee, Yongjoong
Andrighetto, Alberto
Monetti, Alberto
Salvini, Andrea
Zelaschi, Fabio
Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title_full Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title_fullStr Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title_full_unstemmed Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title_short Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
title_sort experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6819864/
https://www.ncbi.nlm.nih.gov/pubmed/31687582
http://dx.doi.org/10.1016/j.heliyon.2019.e02489
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