Abstract
WE have tried to reproduce the procedure recommended by H. Faraggi1 and G. Albouy2 for removing the background on Ilford G5 plates before experimental exposure. The treatment consists in suspending the plates for a certain time in water vapour of a given temperature. After we had made a number of unsuccessful attempts following the methods of other investigators3, it occurred to us that the small chlorine content of Paris water might be responsible for the difference in the results. We tried water containing 12 mgm. chlorine per litre for the production of the water vapour, and found that we could remove the background at 60° C. in five hours (instead of twenty hours required by the French investigators) without affecting the sensitivity of the plates to subsequent β-rays if the plates were dried after the treatment. α-Tracks withstood this treatment. These results seem to throw some light on the process involved.
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References
Faraggi, H., Rev. Sci. Instr., 220, 532 (1951).
Albouy, G., C.R. Acad. Sci., Paris, 230, 1351 (1950). Albouy, G., and Teillac, J., C.R. Acad. Sci., Paris, 232, 326 (1951).
Marguin, G., and Maitrot, M., J. Phys. et le Radium, 15, 123 (1954). Rieder, G., Max Planck Institut für Metallforschung, and other private communications.
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MATITSCH, T., MATIASEK, C. & KARLIK, B. Removal of Background in β-Sensitive Nuclear Emulsions. Nature 175, 35 (1955). https://doi.org/10.1038/175035a0
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DOI: https://doi.org/10.1038/175035a0
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