High-contrast silver halide photographic material and photographic image forming system using the same

An X-ray photographic image forming system system for photographing soft tissues using low-energy X-rays generated at a tube voltage of not more than 40 kV, which comprises:

• (A) a silver halide photographic material comprising a support having on one side thereof at least two light-sensitive emulsion layers, said at least two light-sensitive emulsion layers each having silver halide emulsions different in sensitivity, wherein the upper most light-sensitive emulsion layer is less sensitive than the lower light-sensitive emulsion layer;
• and
• (B) an intensifying screen having a fluorescence layer substantially comprising a Gd.sub.2 O.sub.2 S:Tb fluorescence substance,
• wherein the total silver coat amount of all of said at least two light-sensitive emulsion layers is from 2.0 to 5.5 g/m.sup.2, and said silver halide photographic material exhibits an average contrast of from 3.6 to 4.8 and a sensitivity of from 0.03 to 0.07 lux.sec. when developed with a developer (G) having the following formulation at 35.degree. C. for 25 seconds,
• Formulation of Developer (G):
• ______________________________________ Potassium hydroxide 21 g Potassium sulfite 63 g Boric acid 10 g Hydroquinone 25 g Triethylene glycol 20 g 5-Nitroindazole 0.2 g Glacial acetic acid 10 g 1-Phenyl-3-pyrazolidone 1.2 g 5-Methylbenzotriazole 0.05 g Glutaraldehyde 5 g Potassium bromide 4 g Water to make 1 l pH adjusted to 10.2, ______________________________________
• wherein said X-ray photographic image forming system has a system sensitivity of from 5.5 to 10 mR.

An X-ray photographic image forming system for mammography using low-energy X-rays generated at a tube voltage of not more than 40 kV, which comprises:

• (A) a silver halide photographic material comprising a support having only on one side thereof a light-sensitive layer;
• and
• (B) an intensifying screen having a fluorescence layer substantially comprising a Gd.sub.2 O.sub.2 S:Tb fluorescence substance,
• wherein said screen has an emission luminance of 150 to 250 and a contrast transfer function (CTF) of from 0.40 to 1.00 at a spatial frequency of 5 line pairs/mm, and said silver halide photographic material has an average contrast of 3.6 to 4.8 when developed with a developer (G) having the following formulation at 35.degree. C. for 25 seconds (development processing (1)), and said X-ray photographic image forming system has a system sensitivity of 5.5 to 10 mR when subjected to development processing (1),
• Formulation of Developer (G):
• ______________________________________ Potassium hydroxide 21 g Potassium sulfite 63 g Boric acid 10 g Hydroquinone 25 g Triethylene glycol 20 g 5-Nitroindazole 0.2 g Glacial acetic acid 10 g 1-Phenyl-3-pyrazolidone 1.2 g 5-Methylbenzotriazole 0.05 g Glutaraldehyde 5 g Potassium bromide 4 g Water to make 1 l pH adjusted to 10.2. ______________________________________