Abstract
The activity concentrations of Cs-137 in peat, wood chips and ash products from 13 Swedish district heating plants have been investigated during the winter seasons of 1986/87, 1988/89, 1989/90 and 1990/91. There is a significant decrease in the activity concentration of Cs-137 in the fuel which was especially pronounced between the first two seasons after the Chernobyl accident. In spite of the varying deposition of Cs-137 over the country it has been possible to find a relation between the activity concentration in the peat and wood chips, and the deposition. The total number of Swedish heating plants of which 35–40 are burning peat and 70–75 wood chips have been divided in three groups according to the activity concentration in the ash products. The mean Cs-137 concentration in ash and the total activity ‘produced’ per year in Sweden have been calculated. The maximum ground concentration and corresponding effective dose rate of inhaled Cs-137 as a function of the emission rates of flue gases from stacks with varying heights and during different Pasquill atmospheric stability conditions have been calculated.
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