BS-ISO-7004 Complete Document History
Photography. Industrial radiographic films. Determination of ISO speed, ISO average gradient and ISO gradients G2 and G4 when exposed to X- and gamma-radiation

Complete Current Edition:
   2002 EDITION - GRADIENT and ISO GRADIENT G2 and G - Oct. 16, 2002

Obsolete Revision Information:
   1987 EDITION - PHOTOGRAPHY. INDUSTRIAL RADIOG - Jan. 1, 1987