Radon in indoor air in Norway

The grid cell statistics are based on the national database of indoor radon measurements maintained by the Norwegian Radiation Protection Authority updated to 28th March 2012. Statistical parameters include X (X-co-ordinate of the centre of the cell); Y (Y-co-ordinate of the centre of the cell); N (number of radon concentration data in the cell); am (arithmetic mean Bq/m3); sd (standard deviation associated with am); aml (arithmetic mean of log concentrations); sdl (standard deviation associated with aml); gm (geometric mean); med (median); min (minimum); max (maximum); pct1 (actual percentage of concentrations above 100 Bq/m3); cdf1 (as pct1 but derived from the log-normal distribution of radon values in the cell); bay 1 (as cdf1 but modified using Bayesian statistics on the whole data set); Pct2, cdf2 and bay2 (percentages above 200 Bq/m3); Pct3, cdf3 and bay3 (percentages above 400 Bq/m3)