Abstract
Abstract 210Pb is probably one of the major contributors to the radiation dose received by humans from the fumes emitted from the stacks of power plants using fossil fuels or biofuels. As a first step in the estimation of the total radiological impact on humans of radioactive emissions, we have determined 210Pb radioactivity enrichment factors between fuel and ash products and dose equivalents from 210Pb from stack releases to people living in the surroundings. Radioactivity concentrations in ash, peat, wood and other waste products from forests have been determined in 15 district heating plants, located throughout Sweden, which use bioenergy for hot water production. Dose equivalents to people living close to the plants will be, at most, around a few tens of nSv per year from 210Pb, assuming 1000 Bq.kg-1 in the stack effluent. It was also found that more than 50% of the lead is probably in a volatilised phase, separate from the fly ash, and is therefore not caught in the filters.
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