Safety and security of radioactive sources: towards a global system for the continuous control of sources throughout their life cycle: proceedings of an international conference held in Bordeaux, France, 27 June - 1 July 2005, organized by the International Atomic Energy Agency in cooperation with the European Commission, the European Police Office, the International Commission on Radiological Protection, the International Criminal Police Organization, the International Labour Organization, the International Radiation Protection Association, the World Customs Organization and the World Health Organization, under the auspices of the Group of Eight States and hosted by the Government of France