METAL MATRIX IMMOBILISATION OF SEALED RADIOACTIVE SOURCES FOR SAFE STORAGE, TRANSPORTATION AND DISPOSAL

Metal matrix immobilisation of spent sealed radioactive sources (SRS) is described aiming to ensure safe and secure conditions of storage and to enable consequent retrieval, transportation and disposal of sources into suitable a disposal facility. Metal matrix immobilisation of highly radioactive SRS was developed in the mid 1980s to ensure safe conditions of borehole-type repositories in the former USSR. The immobilisation can be carried out in situ utilising the shielding properties of borehole repositories and enhancing operational safety. Lead and lead alloys have been identified as the most suitable materials for spent SRS immobilisation. Immobilisation ensures safe conditions of long-term storage and considerably enhances the level of physical protection of SRS.