Neutron induced luminescence of insulators
- Osaka Univ. (Japan); and others
Neutron irradiation effect on insulators is one of the main concern for optical diagnostic systems and insulations in fission and fusion reactors. And a number of post irradiation studies for optical and electrical properties of the insulators have been reported. Recently dynamic effects of the irradiation in insulators have been observed as radiation-induced electrical degradation (RIED) and radiation-induced conductivity (RIC) during in-reactor irradiation, though the former effect is not finally confirmed yet. In order to get more information on the dynamic effects in insulators, the authors have performed an in-situ measurement of neutron induced luminescence and/or fluorescence of the insulators (Al{sub 2}O{sub 3} and SiO{sub 2}). In the experiment at YAYOI, luminescence from the specimen in the reactor core is transported to a monochomator away from the core by a light guiding tube, avoiding an influence of background gamma radiation to a photon detecting system. Observed luminescence spectra from Al{sub 2}O{sub 3} and from SiO{sub 2} show broad peak centered at around 430 nm and 480 nm, respectively. Both spectra are very similar to those observed in electroluminescence, indication that the luminescence originates from the oxygen vacancy related color center excited by electronic promotion by neutron irradiation. The spectra changes with irradiation time and some other peaks are newly appeared. The Cherenkov radiation may also have some contribution.
- OSTI ID:
- 197009
- Report Number(s):
- CONF-940664-; TRN: 95:005767-0182
- Resource Relation:
- Conference: ISFNT-3: international symposium on fusion nuclear technology, Los Angeles, CA (United States), 27 Jun - 1 Jul 1994; Other Information: PBD: 1994; Related Information: Is Part Of Third international symposium on fusion nuclear technology; PB: 362 p.
- Country of Publication:
- United States
- Language:
- English
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