Abstract
Radon-222 was measured in 187 dwellings in Parma, Reggio Emilia, and Orvieto. Samples were collected using activated carbon canisters, placed in basements and on the upper floors for at least 48 h in the period starting from January 1989 to July 1990. Gamma spectroscopy was used for the measurement of 222Rn and its progeny. The data for the three towns show a lognormal distribution. Owing to the high radium concentration in building materials and underlying soil, high radon concentrations were observed in Orvieto's dwellings. Additional measurements carried out in 22 public schools of Parma and Reggio Emilia showed moderate radon concentrations, while significant radon levels were recorded in 37 castles and ancient buildings in Parma and Reggio Emilia provinces.
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