This International Standard specifies the constructional requirements of portable, mobile and fixed apparatus for gamma radiography of the following categories designed to allow the controlled use of radiation for industrial purposes :
a) Category I : An exposure container from which the sealed source is not removed for exposure. The beam of radiation is exposed by opening a shutter or rotating the sealed source within the container or by other means. (See figure 1.)
b) Category II : An exposure container from which the sealed source is projected out of the container through a projection sheath to the exposure head for exposure, either mechanically, electrically, pneumatically or by other means by an operator at a distance from the exposure head. (See figure 2.)1'
The operational usage of exposure containers is not covered by this International Standard.
NOTE — If it is proposed to use these exposure containers as transport packages, they should comply with current International Atomic Energy Agency Regulations for the safe transport of radio-active materials2' and/or the relevant national transport regulations.