Hysteresis and dynamic attenuation of ultrasound by lead

Technique, baseed on Granato-Lucket and Rogerse models, which allows to determine number of fixation weak points, as well as, to devide losses into dynamic and hysteresis ones, is suggested. Amplitude dependence of ultrasound absorption in lead with Tl and Sn impurities in superconducting state is analyzed in terms of this technique. Evaluations for atoms and for average distances between fixation weak and strong points are made