Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Photographic Sensitivity as a Function of Exposure Time and Temperature

Not Accessible

Your library or personal account may give you access

Abstract

Reciprocity failure curves in the range between 1- and 256-seconds exposure time of three fine-grain experimental emulsions containing 2.4 mole percent iodide were determined in the temperature range between +50 and −195 C for radiation of 400-mµ wavelength with surface and internal development. The light absorption of the same emulsions in the temperature range between +25 and −137°C for radiation of 400-mµ wavelength was measured.

With internal development, practically no low intensity reciprocity failure occurs at and below −50°C, while with surface development no failure occurs between −50 and −150°C. In no case was high intensity failure observed in this temperature range.

With surface development, an extremely large decrease in sensitivity is observed between −150 and −195°C, together with the appearance of a new type of high intensity reciprocity failure. In the same temperature region, a strongly temperature-dependent fluorescence is observed. It is believed that these two effects are connected, and it appears from sensitometric results that (a) the effect of the fluorescence is restricted to the grain surface, and (b) the fluorescence increases with the intensity of the exciting light at a rate higher than the first power of intensity.

© 1952 Optical Society of America

Full Article  |  PDF Article
More Like This
Sulfur Sensitization and High-Intensity Reciprocity Failure of Silver Bromide Grains*

H. E. Spencer and R. E. Atwell
J. Opt. Soc. Am. 54(4) 498-505 (1964)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved