Negative type silver halide photographic emulsions

Details Negative type silver halide photographic emulsions Negative type silver halide photographic emulsions

1986-07-03

1988-05-24

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430605, 430569, G03C 108

Patent

active

047466030

ABSTRACT:
Negative type silver halide photographic emulsions are provided, formed by growing silver halide grains in the presence of a water-soluble iridium salt in a molar ratio of 3.times.10.sup.-4 mol or more to the amount of the total silver halides used in the formation of the silver halide grains and then chemically sensitizing the surfaces of the grains formed with a sulfur compound or with a sulfur compound and a gold compound. The present emulsions have high sensitivity and extremely improved variation of sensitivity and gradation under broad exposure conditions of high intensity exposure and low intensity exposure.

REFERENCES:
patent: 2448060 (1948-08-01), Smith et al.
patent: 4288535 (1981-09-01), Kanisawa et al.
patent: 4469783 (1984-09-01), Kuwabara et al.
patent: 4477561 (1984-10-01), Menjo et al.
patent: 4617258 (1986-10-01), Menjo et al.
patent: 4621041 (1986-11-01), Saikawa et al.

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