Time dependence of the 137Cs resuspension factor on the Romanian territory after the Chernobyl accident.
On the basis of the radioactivity levels in aerosol and atmospherical deposition samples due to the Chernobyl accident, the resuspension factor of 137Cs as a four-parameter function has been inferred. The standard procedure to derive the dependence of resuspension on time assumes that the initial deposit is instantaneous. A simple method assuming a constant deposition rate over a fixed period has been proposed. Also, based on existing experimental data, an attempt was made to consider a realistic time dependence of the deposition rate to cope with the particular case of the Chernobyl accident. The differences between the two models are outlined. The Chernobyl direct deposit has been assumed to be the deposit measured between 30 April and 30 June 1986. The calculated values of the resuspension factor are consistent with the IAEA's recommended model and depend on the rainfall that occurred in June 1986 and the site-specific disturbance conditions during the first 100 d following 1 July 1986 and only on artificial disturbance by humans and vehicles after that.
Institute of Environmental Research and Engineering, Bucharest, Romania.
B
B
Mihăilă
V
V
Cuculeanu
D000059:Accidents; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002588:Cesium Radioisotopes / Q000032:analysis*; D005843:Geography; D008433:Mathematics; D008962:Models, Theoretical; D009688:Nuclear Reactors; D011891:Rain; D012383:Romania; D013997:Time Factors; D014455:Ukraine
D000396:Air Pollutants, Radioactive; D002588:Cesium Radioisotopes