Abstract: An apparatus for sampling a solidified body in a vessel. The apparatus includes a tubular outer member and a tubular inner member slidable one within the other in close telescopic relationship. A datum location is provided for locating the inner member in an axial and radial datum location in the outer member. In the datum location the outer and inner members define a plurality of longitudinally displaced transverse holes therethrough to permit flow of the body whilst in a fluid state from the outside of the outer member to the inside of the inner member. A sample of the body is provided in the inner member. The solidified body may comprise vitrified highly radioactive waste or intermediate level radioactive waste incorporated in a setting material such as cementitious grout.