| Numéro |
J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
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|---|---|---|
| Page(s) | C10-453 - C10-455 | |
| DOI | https://doi.org/10.1051/jphyscol:198510100 | |
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 46 (1985) C10-453-C10-455
DOI: 10.1051/jphyscol:198510100
Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), Apartado 1827, Caracas 1010A, Venezuela
J. Phys. Colloques 46 (1985) C10-453-C10-455
DOI: 10.1051/jphyscol:198510100
ULTRASONIC ATTENUATION IN GAMMA IRRADIATED VITREOUS SILICA
G. LONDOÑO and R. NAVACentro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), Apartado 1827, Caracas 1010A, Venezuela
Abstract
Longitudinal ultrasonic attenuation measurements in four types of gamma irradiated vitreous silicas have been carried out for frequencies between 30 and 90 MHz over the temperature range from l to 300 K. The magnitude and temperature dependence of the low- and high-temperature ultrasonic relaxations characteristic of glasses were found to be independent of the degree of room temperature gamma irradiation to a dose of 10 MRads. The results indicate that the low activation energy dielectric center created by gamma rays in impure silicas is not acoustically active.