The National Survey on Radon Indoors was designed to estimate the distribution of annual radonconcentration in Italian dwellings, on the basis of a representative sample of about 5000 dwellings. Itstarted in 1989 and ended in 1994, involving all Italian Regions except Sicilia and Calabria, due toorganizational problems in these two regions of Southern Italy. After the official conclusion, tworegional surveys were also carried out in Sicilia and Calabria, using the same experimental apparatusand protocols as in the other Regions.
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