Abstract: The invention relates to a vessel for receiving suspensions containing sos such as radioactive liquids. The vessel includes a bottom wall inclined towards an outlet opening formed therein and a spraying arrangement in the vicinity of the inner walls. In order to reliably discharge solid deposits on the bottom of the vessel while using a minimum of flushing liquid, the bottom of the vessel is provided with a channel extending in the direction toward the outlet opening. A flushing tube pointing into the channel is provided at the highest elevation thereof. The solid/liquid mixture is flushed out of the vessel with great effectiveness by means of a directed delivery of the flushing liquid into the channel.