Abstract
Time-averaged radon concentrations in the outside air in the Netherlands were found to be almost twice as high in the second half of the year as in the first half. Local variations of a factor of 4 occur over rather short distances. Islands in the North Sea have darker parts at their beaches where the gamma-ray activity is above normal. At these spots concentrations of heavy minerals were found. The average particle size of these minerals shows a linear relation with their density. The radioactivity is due to the incorporation of uranium thorium in the crystal lattices of these minerals. Concentration of these minerals elsewhere in the country may well lead to enhaanced outdoor radon concentrations.
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