The filtering effect of buildings on airborne particles

Within the radioecological programme of the Nordic Liaison Committee for Atomic Energy (NKA) the possible consequences of a major reactor accident are one of the main research branches. The study of the filtering effect of buildings on airborne particulate matter has been one part of this branch. The absorbed dose to a person from a passing radioactive cloud will be lower if he has been indoors and not outdoors during the cloud passage. The aim of this study has been to find filtering factors for typical Finnish and Norwegian houses for use in model work. (author)