This publication offers guidance for implementing security measures on 
radioactive sources. It also provides advice on implementing security related 
provisions in the Code of Conduct on the Safety and Security of Radioactive 
Sources  (hereafter referred to as the ‘Code of Conduct’) (see the 
Definitions for explanations of the terms in this publication).
This Implementing Guide, while replacing Security of Radioactive 
Sources — Interim Guidance for Comment (IAEA-TECDOC-1355) , takes 
account of the overall security approach established in that publication which 
some States may have used as a reference in devising their current security 
regimes. This publication has been harmonized with the IAEA’s Categorization 
of Radioactive Sources  and proposes a graded approach to security using a 
set of security levels, and the security functions of deterrence, detection, delay, 
response and security management.