1The term ‘industrial radiography’ is used in this Safety Guide to mean industrial radiography involving radiation sources. ‘Radiation’ as used here means ionizing radiation. The terminology used in this publication is defined and explained in the IAEA Safety Glossary, 2007 Edition [5] (see also http://www-ns.iaea.org/standards/safety-glossary.htm).

2INTERNATIONAL ATOMIC ENERGY AGENCY, Radiation Protection and Safety in Industrial Radiography, Safety Reports Series No. 13, IAEA, Vienna (1999).

3‘Shielded radiography enclosures’ are hereinafter referred to as ‘shielded enclosures’.

4A controlled area is a defined area in which specific protection measures and safety provisions are or could be required for: (a) controlling normal exposures or preventing the spread of contamination during normal working conditions; and (b) preventing or limiting the extent of potential exposures.

5A supervised area is a defined area not designated a controlled area but for which occupational exposure conditions are kept under review, even though no specific protective measures or safety provisions are normally needed.

6In the case of facilities where high energy radiation generators such as accelerators and cyclotrons are to be used, possible non-radiation hazards from noxious gases such as ozone may also need to be considered.

7In facilities with high energy radiation generators such as linear accelerators, additional safety measures such as ‘search and lock up’ systems can be installed to ‘force’ the operator to check physically that the room is empty before initiating the exposure.