2005 年 40 巻 3 号 p. 295-301
Reacting upon the increasing concern of possible harmful effects due to radon, more and more countries established, or intend to establish in the near future, legislation for the radon level both for homes and workplaces. The dose due to radon seems to be more complicated to assess for workplaces than for homes, although the basic principles of dose estimation are the same. The doses at workplaces need to be estimated by individual approaches, but such requirement is usually not reflected in the legislations. The present study deals with characteristic situations and refers to findings and considerations in the cases of offices, schools, underground workplaces, and open air working situations with relatively high radon level. It discusses the possible inaccuracies caused by the improper selection of time periods and methods in the measurements of the average radon concentration. The purpose of this paper is to provide some examples (mainly based on the authors' experiences) to show difficulties that might emerge in the determination of average radon concentrations in various workplaces. This will help choose the proper measurement methods for each case and contribute to the regulator's work in the precise and unambiguous legislation phrasing.