Monitoring of Radiation in the Environment. Results in the Netherlands in 1998

This report presents the results of radioactivity measurements in the environment in the Netherlands carried out by four organisations in 1998. The yearly averaged gross alfa- and gross beta-activity concentrations in air dust in Bilthoven were 0.0812 and 0.398 mBq4m-3, respectively. The yearly averaged activity concentrations in air dust for the nuclides 7Be, 137Cs and 210Pb were 4020, 1.26 and 325 uBq4m-3, respectively. The yearly total gross alfa- and gross beta-activities deposited in Bilthoven were 31.1 and 106 Bq4m-2, respectively. The yearly total activities of the nuclides 3H, 137Cs, 7Be, 210Pb and 210Po in deposition were 1200, 0.60, 1840, 163 and