Variations in Natural γ-Radiation in Sweden

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Abstract
The ionization due to gamma-radiation from radioactive substances in the ground is detd. by calculation and measurement. Observations of the gamma-radiation in 68 houses in Sweden has shown that the ionization varies between 5-30 ion pairs/cu.cm. sec. It is believed that a more extensive investigation will give still larger differences. The biologic importance of the natural gamma-radiation is discussed.
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