Determination of the effective impulse time duration of interaction of soft X - Radiation with matter

It is known that under the interaction of the pulsed power with the matter the ablation occurs. From one side this ablation leads to the shock wave formation in the condensed matter from an other leads to the screening of the power and decreasing of its interaction with target. We suggest a new method of determination of the effective time of interaction of the powerfull radiation with condensed matter. This method based on known method of determination of sound velocity in compressed matted described in [1].