Local static method for measuring radon emanation rate from porous material

This paper mainly discusses a new idea about calculation formula of local static method as which is used to measure radon emanation rate from porous material, so as to be in keeping with practice. New formula given in this paper has considered four factors affecting radon building up in collecting space during measurement: emanation, reverse diffusion into porous material, leakage and radioactive decay. Equi-interval sampling method has been found out to make new formula easier to use. Experiment results indicate that the new formula tallies with practice much better than primary formula does