Composite of silver halide photographic light-sensitive material and radiation fluorescent screen

Claim 1

A composite for radiography comprising a) a silver halide photographic light-sensitive material comprising a transparent support and at least one light-sensitive silver halide emulsion layer provided on each side of the support, b) fluorescent screen A having a 80 kVp X-ray energy absorption of 40% or more and c) fluorescent screen B having a 80 kVp X-ray energy absorption of not less than 25% more than fluorescent screen A, the material being sandwiched between the screens A and B in such a manner that emulsion layer A is in close contact with screen A and emulsion layer B is in close contact with screen B, and screen A being positioned on the X-ray radiation source side, wherein the slope of the straight portion in the characteristic curve of emulsion layer A is less than that of emulsion layer B and emulsion layers A and B of the silver halide photographic light-sensitive material have sensitivity on an exposed side that, when the material is exposed to a monochromatic light having the same wavelength as a main emission peak wavelength of the screens and having a half band width of 15±5 nm and developed at 35° C. for 25 seconds with the following developer, an exposure necessary to give a density of the minimum density+0.5 is 0.027 to 0.040 lux·second, ______________________________________ Developer Potassium hydroxide 21 g Potassium sulfite 63 g Boric acid 10 g Hydroquinone 26 g Triethylene glycol 16 g 5-methylbenzotriazole 0.06 g 1-phenyl-5-mercaptotetrazole 0.01 g Glacial acetic acid 12 g 1-phenyl-3-pyrazolidone 1.2 g Glutaraldehyde 5 g Potassium bromide 4 g ______________________________________ Water added to 1 liter, and pH adjusted to 10.0.