Abstract
Two apparatuses consisting of cylindrically arranged high-pressure ion chambers (diameter of sample container approximately 1 m., total volume approximately 3 m.3, 20 kgm. nitrogen and carbon dioxide) placed in a low-background laboratory in the rock near the city of Stockholm, and protected in all directions by 1 m. of water and more than 50 m. of granite, have been described in earlier communications1. In these, the results of measurements on 306 persons who have had no known contact with other than natural radioactive material of common concentration were also reported. The γ-radiation of human subjects is, in all probability, caused mainly by the potassium-40 content of the body, as has been shown by Burch and Spiers2.
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References
Sievert, R. M., “Peaceful Uses of Atomic Energy”, 13, 187 (1955); Strahlentherapie, 99, 185 (1956). Sievert, R. M., and Hultqvist, B. (to be published).
Burch, P. R. J., and Spiers, F. W., Nature, 172, 519 (1953).
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SIEVERT, R., GUSTAFSSON, S. & RYLANDER, C. Increase in γ-Radiation from Powdered Milk and Beef, 1953-56. Nature 178, 854–855 (1956). https://doi.org/10.1038/178854a0
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DOI: https://doi.org/10.1038/178854a0
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