The contributions of radon and thoron from building materials to total radon (thoron) entry rates in
dwellings range from almost zero to several percent. It is necessary to measure radon and thoron
exhalation rates, among other things, to assess the radiological hazard to human health in a living
environment. Brick and granite specimens were used to study the changes of these rates as a function of
the relative and absolute humidities. Measurement results showed that radon and thoron exhalation
rates change to humidity with the same trends as well as effective dose could be changed by the factor of
2 due to this.