Discusses building 'safe' houses, describes the decay chain of uranium 238 and the qualities of radon, and risks of developing lung cancer run by miners and householders. Figures for lung cancer in the USA are quoted. Details from three studies in Houston, Maine and Sweden are given. Discusses sources of radon, e.g. water, building materials, soil. A study of houses in Pennsylvania indicated that high radon concentrations occurred over Cambro-ordovician sediment rock. Discusses movement of radon from soil into dwellings.
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