§ Mr. Barry FieldTo ask the Secretary of State for the Environment what information he has as to the causes of radiation dose rates in certain non-granite areas being higher outdoors than indoors.
§ Mrs. Virginia BottomleyDose rates from cosmic rays are usually lower indoors than outdoors because of the shielding provided by building materials. Dose rates from terrestrial gamma rays are occasionally lower indoors than outdoors because the activity of natural radionuclides in the building materials is lower than in the ground on which the building stands.