Abstract
WE have kept some Ilford Nuclear Research photographic plates in our underground laboratory, which is at a depth of 30 m. under London clay (60 m. water-equivalent). Hot liquid emulsiOn was brought from the Ilford works to the laboratory, where the required volume was measured out in a measuring cylinder and then poured on to a horizontal glass plate. After leaving to dry for one day, the plates were cut to a convenient size and stored vertically. After a period of sixty days, they were developed in the same underground laboratory. We feel confident that any nuclear tracks we observe were produced underground. We have so far examined 10 c.c. of emulsion, and have found six nuclear disintegrations containing three or more tracks. This gives a rough estimate for the rate of production of these stars at this depth of â¼ 0.01 ± 0.004 stars/c.c./day. The numbers of tracks in the various stars were as follows:
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Harding, J. B., Lattimore, S., Li, T. T., and Perkins, D. H., Nature, 163, 319 (1949). George, E. P., and Jason, A. C., Proc. Phys. Soc., 62, 243 (1949).
Wilson, J. G., Proc. Roy. Soc., A, 174, 73 (1940). Code, Phys. Rev., 59, 229 (1941). Shutt, Phys. Rev., 61, 6 (1942).
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EVANS, J., GEORGE, E. Observation of Nuclear Disintegrations Below Ground. Nature 164, 20 (1949). https://doi.org/10.1038/164020a0
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DOI: https://doi.org/10.1038/164020a0
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