Radiation effects and defects in solids vol:137 issue:1-4 pages:1395-1398
Ultrasonic attenuation measurements are carried out for a quartz specimen irradiated with 4.7 x 10(19) n/cm(2) and annealed at 700 degrees C during 1 hour. This dose is interesting because it is situated in the 'threshold region'. The measurements are carried out as a function of temperature (0.3-20 K) for different frequencies (80-300 MHz). The data show a behaviour that is qualitatively similar to previous observations for a much lower dose, and indicate a tendency to return to the crystalline state.