GAMMA-RAY INSENSITIVE EMULSION. Quarterly Report No. 5 for April 1, 1957-June 30, 1957
Reversal development without or with dye coupling second development or silver intensification followed by rebromination and subse quent dye coupling development are capable of yielding good acceptable positive images in the presence of undesired fcgging gamma-ray dosages of 150 to 200 rcentgens. A standard negative development technique wculd fail to discriminate light images from fog caused by gamma radiation of only a few rcentgens. If subsequent printing of the transparency on high contrast printing stock ( via an internegative or directly on autopositive material) in employed, still higher gamma dosages can be tolerated. The reversal development technique also results in an image of very low graininess, as opposed to normal negative development techniques with subsequent printing onto high contrast positive material. Thin technique has been established for Ansco Hypan Film (ASA Exposure Index 40 for daylight), without any visible loss in definition, The influence of developer dilution, developer retarders and developer temperature on the light to gamma speed ratio was also investigated. Among these factors developer dilution in conjunction with prolonged development appears to be the most promising approach for improving the light to gamma speed ratio. (auth)
- Research Organization:
- Ansco Div., General Aniline and Film Corp., Binghamton, N.Y.
- NSA Number:
- NSA-12-016921
- OSTI ID:
- 4296690
- Report Number(s):
- AD-142731
- Country of Publication:
- United States
- Language:
- English
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