Abstract
NEHER has suggested1 that the approximate lower limit of the exposure rate resulting from soil radioactivity be taken as 1.4 µr./h, an unpublished value measured by Millikan in Manitoba. Subsequent surveys in Europe and the United States2,3 reported minimum values for the intensity of terrestrial ionization which averaged approximately 4.5 µr./h. Millikan's value was also less than that found in the exhaustive study by Hultqvist4, in which the lowest indoor gamma level, as measured in wooden houses, was about 5.5 µr./h.
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References
Neher, H. V., Science, 125, 1088 (1957).
Solon, L. R., Lowder, W. M., Zila, A. V., Levine, H. D., Blatz, H., and Eisenbud, M., Science, 127, 1183 (1958).
Solon, L. R., Lowder, W. M., Shambon, A., and Blatz, H., US Atomic Energy Comm. Health and Safety Lab. Report, No. 73 (November 1959).
Hultqvist, B., Kingl. Svenska Vetenskapsakademiens Hadlingar, 6, No. 3 (1956).
Beck, H. L., Condon, W. J., and Lowder, W. M., US Atomic Energy Comm. Health and Safety Lab. Report, No. 145 (April, 1964).
Wollenberg, H. A., and Smith, A. R., Earth Materials for Low Background Radiation Shielding (Univ. Calif. Radiat. Lab., 9970, May 24, 1962).
Shamos, M. H., and Liboff, A. R., J. Geophys. Res., 7, 19 (1966).
Shamos, M. H., Ann. Report, US Atomic Energy Comm. Div. Biol. and Med., 33 (1966).
Roser, F. X., and Cullen, T. L., in The Natural Radiation Environment (edit. by Adams, J. A. S., and Lowder, W. M.), 825 (University of Chicago Press, 1964).
Davis, G. L., and Hess, H. H., Amer. J. Sci., 247, 856 (1949).
Hamilton, W., and Mountjoy, W., Geochim. Cosmochim. Acta, 29, 661 (1965).
Ahrens, L. H., in Nuclear Geology (edit. by Faul, H.), 131 (John Wiley, New York, 1954).
Wasserburg, G. J., MacDonald, G. J. F., Hoyle, F., and Fowler, W. A., Science, 144, 465 (1964).
Ringwood, A. E., J. Geophys. Res., 67, 857 (1962).
Ringwood, A. E., J. Geophys. Res., 67, 4473 (1962).
Lovering, J. F., and Morgan, J. W., Nature, 197, 138 (1963).
Sharpe, J., Nuclear Radiation Detectors, 98 (Methuen, London, 1955).
Hess, V. F., and Vancour, R. P., Phys. Rev., 76, 8, 1205 (1949).
Barton, J. C., and Michaelis, E. G., Proc. Phys. Soc., 77, 377 (1960).
Barnothy, J., and Forro, M., Phys. Rev., 74, 1300 (1948).
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LIBOFF, A., SHAMOS, M. Ultra-low Levels of Terrestrial Ionization. Nature 217, 629–631 (1968). https://doi.org/10.1038/217629a0
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DOI: https://doi.org/10.1038/217629a0
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