Derivation of UK unconditional clearance levels for solid radioactively contaminated materials

This report describes a study to derive radionuclide concentration levels suitable for use in the UK for the unconditional clearance of radioactively contaminated solid materials. These new levels are based on the radiological criteria for clearance given in international basic safety standards for protection against ionising radiation. It is shown that continued use of the levels in existing UK legislation would also meet these criteria. (author)