抄録
Radon short-lived decay products generated from the earth is one of the serious indoor air pollutants in Europe and US. We set up boxy measuring devices, which were developed by National Institute of Radiological Science, Japan, in the campus of Hokkaido University. By using the filter pack method we measured concentration of radon and its decay products inside of the boxy measuring device and the surrounding outdoor air. We also performed to measure ventilation rate of the device. By using the ventilation rate and concentration values radon exhalation rate was calculated. We found out that radon exhalation rate might be significantly related with atmosphere pressure We calculated required ventilation rate by using radon exhalation rate in underground spaces, which would get into high concentration when ventilation rate was very low.
