Historical
IEC 61331-2 Ed. 1.0 b:1994
Protective devices against diagnostic medical X-radiation - Part 2: Protective glass plates
Applies to protective glass plates for use in radiological equipment or in radiological installations where an optical transmission of visual images, type SC, or other kind of viewing, type VI, through protective shielding is to be realized.
International Electrotechnical Commission [iec]