Influence of the Chernobyl Accident on Radioactivity of Fuel Peat and Peat Ash in Finland.

摘要

The accident at the Chernobyl nuclear power plant in April 1986 caused very uneven deposition of radionuclides in Finland. The deposited radionuclides were measured in relative high concentrations in fuel peat and especially in peat ash. The radionuclide concentrations were measured at six peat-fired power plants in different parts of Finland throughout the heating season 1986-1987. Also evaporation of different radionuclides in peat combustion and their condensation on fly ash particles were studied at four power plants. The (sup 137)Cs-concentrations in compiled peat samples varied between 30 and 3600 Bq kg(sup -1) dry weight and in ash samples between 600 and 68000 Bq kg (sup -1). Differences in radionuclide concentrations between the power plants were great and also the radionuclide composition in fuel peat varied regionally. The (sup 137)Cs-concentrations of the fly ash after the ash precipitators varied between 12000 and 120000 Bq kg (sup -1) and fly ash emissions varied from 17 to 1100 mg m(sup -3), depending on the power plant and the load of the boiler. High radioactivity concentrations in precipitator ash caused some restrictions to the utilization of peat ash for various purposes. (ERA citation 13:041321)