The IAEA Code of Conduct on the Safety and Security of Radioactive Sources (the ‘Code’, IAEA/CODEOC/2004) describes how States can safely and securely manage high risk radioactive sources. Paragraphs 23 – 29 of the Code relate to the import and export of radioactive sources, and some States requested further guidance on how these paragraphs should be implemented. ‘Guidance for the Import and Export of Radioactive Sources’ (the ‘Guidance’) has, therefore, been developed by technical and legal experts nominated by IAEA Member States. It provides specific guidance on how States can implement paragraphs 23 – 29 of the Code. This Guidance has been approved by the IAEA Board of Governors, endorsed by the IAEA General Conference, and has been published as a supplement to the Code.