Experimental study of consistency degradation of different greases in mixed neutron and gamma radiation
| Autor: | Alberto Andrighetto, Fabio Zelaschi, A. Zenoni, A. Monetti, Andrea Salvini, Yongjoong Lee, M. Ferrari, Monika Hartl |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
inorganic chemicals Nuclear engineering Materials science Astrophysics::High Energy Astrophysical Phenomena Nuclear Theory Radiation effect Radiation Lubricating grease Article TRIGA 03 medical and health sciences 0302 clinical medicine Nuclear reactor irradiation Research reactor Spallation Neutron Irradiation Aerospace engineering Industrial engineering Materials chemistry Mechanical engineering Mixed radiation field Neutron damage Polymer degradation lcsh:Social sciences (General) lcsh:Science (General) Nuclear Experiment Radiation resistance Multidisciplinary integumentary system technology industry and agriculture 030104 developmental biology biological sciences lcsh:H1-99 lipids (amino acids peptides and proteins) 030217 neurology & neurosurgery lcsh:Q1-390 |
| Zdroj: | Heliyon Heliyon, Vol 5, Iss 9, Pp e02489-(2019) |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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