期刊
FUSION ENGINEERING AND DESIGN
卷 84, 期 2-6, 页码 514-517出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2009.01.091
关键词
Electron paramagnetic resonance; Neutron effects; Gamma-irradiation effects; Point defects; a-SiO(2)
Electron paramagnetic resonance (EPR) studies have been carried Out on KU1 fused silica irradiated with neutrons at fluences 10(21) and 10(22) n/m(2), and gamma-ray doses up to 12 MGy. The effects of post-H-radiation thermal annealing treatments, up to 850 degrees C, have also been investigated. Paramagnetic oxygen-related defects (POR and NBOHC) and P-type defects have been identified and their concentration has been measured as a function of neutron fluence, gamma dose and post-irradiation annealing temperature. It is found that neutrons at the highest fluence generate a much higher concentration of defects (mainly E' and POR, both at concentrations about 5 x 10(18) spins/cm(3)) than gamma irradiations at the highest close (mainly E' at a concentration about 4 x 10(17) spins/cm(3)). Moreover, for gamma-irradiated samples a lower treatment temperature (about 400 degrees C) is required to annihilate most of the observed defects than for neutron-irradiated ones (about 600 degrees C). (c) 2009 Elsevier B.V. All rights reserved.
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