Photographic image enhancement by a gold-toning neutron-activati

Details Photographic image enhancement by a gold-toning neutron-activati Photographic image enhancement by a gold-toning neutron-activati

1980-08-15

1982-04-06

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Chromatic image produced from achromatic reproduction image

430 16, 430373, 430414, 430432, 430953, G03C 700

Patent

active

043236413

ABSTRACT:
A gold-toning neutron-activation process for intensifying or amplifying the ontrast in extremely weak images in photographic negatives where the exposure level may be as low as 1.5% of optimum. The method involves three main steps: (a) gold toning of the silver image on the negative; (b) neutron activation of the gold image to produce radioisotopes; and (c) transferring the image to an unexposed autoradiographic film as the ionizing radiation from the radioactive gold exposes the film to produce intensification of the contrast.

REFERENCES:
patent: 2407381 (1946-09-01), Pecher
patent: 2575002 (1951-11-01), Carroll
patent: 2603755 (1952-07-01), DeMent
patent: 3852072 (1974-12-01), Gerber et al.
patent: 4085331 (1978-04-01), Thackray
patent: 4137461 (1979-01-01), Murray

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