ISO 4090-2001 “Photography. Dimensions and specifications for X-ray negative cassettes/shields/films and hardcopy imaging films for medical radiography.
■ Optical density reference hole: 26 × 26 mm;
■ Copper wire mesh: grid 3.18 mm, grid diameter 0.75 mm;
■ Shell: 420 × 450 × 6 mm.
