LAUSR

Abstract To develop an accurate and convenient measurement method for radon exhalation rate of building materials is of great importance not only for mitigation of indoor radon, but also for public health. In this study, we have developed a new charcoal closed chamber method for radon exhalation rate measurement, which combine the advantages of charcoal method and closed chamber method. The results showed that the chamber in our study has good air tightness. Besides, the charcoal materials own stable and high adsorption property. On this basis, the new charcoal closed chamber method can be nearly unaffected by back-diffusion and show the advantages of simple operation and accuracy. It is worth noting that the new method is especially suitable for small size samples. In all, the charcoal closed chamber method established in our study can be a helpful supplement to the existing methods for radon exhalation rate.