Abstract
The content of radioactive material as well as the granular composition of 12 samples from the bottom of the Ijselmeer (Zuiderzee) was determined. It was found, that the radioactivity increases regularly with the percentage of fine material (grain size < 50 μ) and also with the specific surface of the mineral part of the material. There is no reason to believe, that the presence of radioactive elements is restricted to a special grain size fraction of the fine material. It is suggested, that the detected correlation may be related with a preference of special minerals (e.g. zircon) for the smaller grain sizes.
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