The variation of the radon emanation coefficient on aerated concrete blocks with respect to water content, temperature and humidity

Abstract

Objective To study the variation of radon emanation coefficient of aerated concrete blocks with respect to moisture content, temperature and relative humidity. Methods By using continuous radon measurement instrument and sealed cavity, the radon emanation coefficients were obtained in conditions of different moisture (0-60%), temperature (10-40℃)and humidity (12%-95%). The variation of radon emanation coefficients (e) with respect to moisture (s), temperature (T) and humidity were also studied by regression analysis. Results The study showed a logarithmic increase in radon emanation coefficient with the increased moisture [e=0.096·ln(s+ 2.43)+ 0.03, R2=0.952], a linear increase with increased temperature (e=0.002 45·T+ 0.060 1, R2=0.987), and no significant influence on radon emanation coefficient with respect to humidity (P>0.05). Conclusions Both moisture and temperature affect the radon emanation coefficient to a larger extent. Attention should be paid to both factors in the assessment and control system of radioactive hazard from building materials. Key words: Aerated concrete block; Radon emanation coefficient; Moisture content; Temperature; Relative humidity