We. Alnaser et M. Zein, THE EFFECT OF NEUTRON AND GAMMA-IRRADIATION ON THE DISLOCATION RELAXATION PEAK IN SILVER, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 15(6), 1993, pp. 829-834
The internal-friction spectrum has been determined in extremely pure p
olycrystalline silver crystals after being subjected to neutron and ga
mma irradiation. The spectra obtained for an applied frequency of 10 M
Hz show that the mechanical losses due to dislocation relaxation decre
ase as the doses of neutron and gamma radiation increase. The effect o
f gamma radiation was found to be more significant than that of neutro
n irradiation. The relationship between damping neutron and gamma dose
was found to be of the form Q(max)-1 is-proportional-to LAMBDAD(eta)
where eta is equal to - 1.2 for neutron and - 1.45 for gamma irradiati
on. The variations of the peak height and width, and temperature of th
e dislocation relaxation peak as functions of neutron and gamma doses
are explained in terms of the pair-kink formation model.