Intensification and Reduction of Kodak No-Screen Medical X-Ray Film

摘要

Experiments were conducted on Kodak No-Screen Medical X-ray Film to assess the possible methods for the reduction of overexposed film and the intensification of underexposed film. The image density on films given 10 times the normal exposure was successfully reduced by decreasing either or both the time and temperature of development and by using Farmer's Reducer (Ansco 310) on the normally developed film. The use of a reducing solution on developed film was judged to be the best approach because the reduction can be controlled accurately and the reduced image suffers no loss of detail. The methods of intensification assessed included increasing the development time and temperature, intensifying the film after development with Kodak Chromium Intensifier (In-4) or Mercury Intensifier (In-1), and fogging the underexposed film prior to development with mercury vapor or with light. Intensification after development produced the best results; the image density above that of the background was increased 42 percent after one treatment with mercury intensifier and 24 percent after one treatment with chromium intensifier. (Author)