Characterization of a polyphenyl ether oil irradiated at high doses in a TRIGA Mark II nuclear reactor

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:497

Article

Ferrari, Matteo^1,2  Zenoni, Aldo^1,3  Lee, Yongjoong⁴  Hayashi, Yoshikazu⁵ 

[1] Univ Brescia, Dipartimento Ingn Meccan & Ind, Via Branze 38, I-25123 Brescia, Italy

[2] CERN, CH-1211 Geneva 23, Switzerland

[3] INFN, Sez Pavia, Via Bassi 6, I-27100 Pavia, Italy

[4] European Spallat Source, Odarslovsvagen 113, SE-22484 Lund, Sweden

[5] MORESCO Corp, Chouo Ku, 5-5-3 Minatojimaminamimachi, Kobe, Hyogo 6500047, Japan

关键词: Radiation effects;    Neutron damage;    Lubricating oil;    Polyphenyl ether;    Radiation tolerance;    Mixed radiation field;   

DOI  :  10.1016/j.nimb.2021.03.021

来源: Elsevier

【 摘 要 】

Samples of a commercially available polyphenyl ether (PPE) oil are irradiated in the mixed neutron and gamma radiation field of the Pavia TRIGA Mark II reactor, at irradiation doses ranging from 0.78 MGy to 7.8 MGy. The oil is a nuclear grade product, whose radiation resistance reported in the product specification is based on cobalt-60 gamma irradiation data. The collection of additional data in a nuclear reactor radiation field performed in the present work, is motivated by the need to use this oil in neutron-rich environments such as targets and accelerators. The post-irradiation characterization of the oil samples here reported includes viscosity measurements, total acid number (TAN), Fourier transform infrared spectroscopy (FT-IR), gas chromatography (GC), gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy. The presented results evidence a remarkable increase of kinetic viscosity with the absorbed dose. Differences in the radiation-induced viscosity increase are observed comparing the data collected in mixed neutron and gamma radiation with the previous ones collected in cobalt-60 gamma radiation. This result emphasizes the need of further studies on the dependence of the radiation damage on different radiation environments. A negligible increase of TAN is reported. The FT-IR, GC, GPC and NMR show progressive polymerization with increasing dose. The increasing molecular size is in line with the viscosity data presented.

【 授权许可】

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