GAMMA-RAY INSENSITIVE EMULSIONS. Quarterly Report No. 7 for October 1, 1957-December 31, 1957
Previous work on the possibility of re-covering gammairradiated film for a subsequent light exposure was continued in order to learn more about the relative contribution of surface sensitivity centers and latent image centers after a bleach treatment. The considerable speed loss due to this treatment for a subsequent light exposure can be related to the presence of a relatively strong internal image caused by the gamma-ray exposure. Emulsions having a hlgh surface/ internal sensitivity ratio are advantageous for recovery treatment although even with such emulsions a speed loss of several stops is encountered. Further experiments were made on the tolerable dosage for obtaining acceptable image records if the fogging radiation varies in energy. Due to the increased sensitivity of photographic emulsion to lower energy radiation, the tolerable dosage decreases for softer gamma- and x-rays with which the film is exposed. No change in tolerable dosage is expected for radiation energies higher than that of a Co/sup 60/ source. Development retarders incorporated into the photographic emulsion do not provide a tool for increasing the light to gamma-radiation speed ratio. The reversal and dye intensification technique described previously was successfully extended to five different commercial negative materials. (auth)
- Research Organization:
- Ansco Div., General Aniline and Film Corp., Binghamton, N.Y.
- NSA Number:
- NSA-12-008601
- OSTI ID:
- 4322792
- Report Number(s):
- NP-6665
- Country of Publication:
- United States
- Language:
- English
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