Method of monitoring of undisturbed radon flux density from the soil surface

The results of analysis of existing measurement methods of radon flux density from the soil surface were presented in this work, and the revealed disadvantages of the methods were indicated. A new method of monitoring of undisturbed radon flux density from the soil surface, which is applied for its using in the large range of meteorological conditions, was developed. Outline of the method was given. The method is based on registration of $\alpha$-radiation of radon decay products collected inside the accumulative chamber, which is installed on the soil surface. The accumulative chamber has some small vent holes for partial soil gas emission. The calibration procedure for determination of correction coefficient is described. The results of the method approbation and monitoring data, which was obtained by different methods, are discussed. The new method differs from its analogues in that it allows investigating daily variations of radon flux density.