Accidents with severe consequences are usually given extensive publicity, and in spite
of their adverse effects, they provide for an increased awareness of the risks associated with radiation sources, especially SRS. Since the risk concept has so many dimensions it is not possible to make a detailed analysis of the risk perceived. The emphasis in this report will,however, be on the factors that affect the risk and on the technical and administrative measures that could be taken to reduce the accident probability or limit the accident consequences.