  M\"{o}ssbauer spectroscopy is applied to study ultrasound vibration of a
granular material. A pile of powder is placed onto the surface of piezo
transducer vibrated with the frequency 12.68 MHz. The size of grains (1.3
$\mu$m) is much smaller than the wavelength of ultrasound, but much larger than
the vibration amplitude. Due to vibration a single line of the M\"{o}ssbauer
transmission spectrum is split into a comb structure with a period equal to the
vibration frequency. This spectrum contains the information about fast and slow
modes in granular dynamics. We developed a method which allows to measure decay
of ultrasound in the granular material and to estimate the results of the
particle convection of grains in the pile.
