Releases of natural radionuclides from oil-shale-fired power plants in Estonia

ashes capa arable del suelo cendre cendre volante ceniza couche arable depth desechos energy generation estonia estonie fly ash polvo de cenizas potasio potassium power stations procesos de transporte en el suelo profondeur profundidad radio radioisotopes radioisotopos radium soil soil morphological features soil transport processes sol suelo thorium top soil trait morphologique du sol transition elements transport dans le sol wastes