A sampling device for collecting depth-specific samples in silt, sludge and granular media has three chambers separated by a pair of iris valves. Rotation of the middle chamber closes the valves and isolates a sample in a middle chamber.
STATEMENT OF U.S. GOVERNMENT RIGHTS
This invention was made with Government support under Contract Number DE-AC09-96SR18500 between Washington Savannah River Company and the United States Department of Energy. The U.S. Government has certain rights in this invention.