System and method for radiological image formation

An image-forming system for radiological imaging consisting of an intensifying screen comprising on a support at least one layer of a green-light emitting phosphor and, in operative association therewith, a prehardened light-sensitive photographic silver halide film material, comprising a support and on both sides thereof one or more hydrophilic colloid layers, said layers being hardened to such an extent that their swelling degree is reduced to less than 200% after immersing said material for 2 minutes in demineralized water of 35.degree. C.;

• comprising in at least one of said hydrophilic layers chemically ripened, monodisperse cubic silver chloroiodide grains having a mean crystal diameter of from 0.40 .mu.m up to 0.65 .mu.m, wherein said grains have been spectrally sensitized for the wavelength range between 520 and 580 nm, have a maximum absorption between 540 and 550 nm and have been coated in a total amount of silver per sq.m. of from 6 g up to 8 g, wherein said amount is expressed as an equivalent amount of silver nitrate per sq.m.;
• characterized in that in said image-forming system said silver chloroiodide grains have been chemically sensitized with one or more selenide compound(s) generating silver selenide in an emulsion comprising said grains at a temperature of from 45.degree. C. up to 70.degree. C. at an electrical potential difference between a silver electrode and a saturated silver/silver chloride reference electrode of from 100 up to 200 mV.