Measurement of Environmental Gamma Radiation in Norwegian Houses

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Abstract
Results of measurements of the environmental radiation inside Norwegian houses are reported. Three types of measuring equipment were used, i.e. a scintillation rate meter specially designed for low intensity measurements, a Geiger counter with a rate meter, and an ionisation chamber. The average dose rate in air due to environmental radiation was found to be 87 mrad/year inside houses with outer walls of wood, 115 mrad/year for buildings with outer walls of concrete and 129 mrad/year for buildings with outer walls of brick. The average of all the 2026 measurements inside Norwegian houses is 83 mrad/year for the dose rate due to gamma rays, when 25 mrad/year due to cosmic rays is subtracted.

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