Soil radon entry to a house and indoor concentration level are affected by many factors, such as the infiltration characteristics of the house, air tightness of the substructure of the house, air permeability of the soil, radon content in the soil and many others. Amongst them, the structure of the house, particularly its substructure is certainly one of the most crucial factors. It determines radon entry routes and indoor radon distribution, and consequently, affects the effectiveness of radon control measures applied in the house. The paper focuses on houses with cellars, a type of dwelling in Derbyshire, North England where high indoor radon levels have been found in over 20/100 homes.
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