Based on the principle of that the equivalent decay constant of perforated accumulation chamber, we propose a new method to rapidly measure the surface radon exhalation rate with multi-point detection technique. In our method, we first place the radon accumulation chamber on the surface of the samples then collect and calculate the radon exhalation rate. After a certain time, the radon chamber is connected with the radon exhalation rate measuring monitor. Radon concentration is calculated and the radon exhalation rate is measured. The relative error of radon exhalation rate measured by us is smaller than that by the standard device of South China. Obviously, the proposed method here can meet the need to measure the radon exhalation rate distribution on the surface of tailings reservoir in a wide area. The reviled method provides a feasible and believable means to measure the radon exhalation rate both rapidly and accurately.
