Reduction of spurious scattering in Ilford G-5 and K-5 emulsions
In an attempt to reduce the amount of sparious scattering in emulsions, two batches of Ilford G-5 and two batches of Ilford K-5 stripped emulsions, 600 μ thick, were exposed to the 6.2 Bev internal proton beam from the Berkeley Bevatron. The methods of development used included isothermal development at 5 ° , 10 °, and 15 °C, and temperature cycle developm ent with the warm stages at 10° , 15 ° , and 20 °C with the plates immersed in a boric acidpotassium bromide solution. For comparison some emulsions were also developed by "dry," warm development at 25 °C. As a further precaution against distortions, potassium alum hardener was added to the fixing bath, and the emulsions were dried slowly at a temperature below 10 ° C. Scattering measurements performed on the 6.2 Bev proton tracks in the emulsions show that spurious scattering was reduced to about half the value usually obtained. This applies to all the plates, except for a G-5 emulsion from one batch that was developed at 26 °C. It was observed that the amount of spurious scattering depends on the development temperature. It does not change between temperatures of 5 ° and 10 °C. Above 10 °C there is a gradual increase with temperature. In some emulsions a marked increase of spurious scattering occurs at a temperature of about 25 ° C. Some variation in the amount of spurious scattering present in the different batches of emulsions used was observed, but there appears to be no difference in that respect between the G-5 and the K-5 emulsions. Good grain densities on minimum tracks and improved uniformity of development with depth in both the G-5 and the K-5 emulsions were obtained using the temperature cycle methods of development with warm stages at 10 ° , 15 ° , and 20°C.
- Research Organization:
- National Research Council, Ottawa
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-023053
- OSTI ID:
- 4153206
- Journal Information:
- Nuovo Cimento, Journal Name: Nuovo Cimento Journal Issue: 5 Vol. 16; ISSN 0029-6341
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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