Unperturbed, high spatial resolution measurement of Radon-222 in soil-gas depth profile

This work presents a method for measuring the depth distribution of Rn-222 activity in soil gas. The method is based on the capacity of polycarbonates to absorb Rn-222 and on the possibility of performing sensitive measurements of Rn-222 absorbed by the polycarbonates via liquid scintillation counting (CSC). The method is the following: cylindrical holes are drilled along a metal rod and Malcrofol. N polycarbonate foils enclosed in polyethylene envelopes are placed in each hole. The rod is driven into the soil and kept for a certain time. As long as the rod is in the soil, the polycarbonate foils are exposed to the Rn-222 concentration at their depth. At the end of the exposure the rod is pulled out and the foils are transferred to liquid scintillation (IS) vials filled with liquid scintillator. The Rn-222 absorbed in the foils is then measured with a LS analyzer. The rod with the polycarbonate foils acts as a passive probe which senses the Rn-222 concentration at different depths beneath the ground surface. The achievable minimum detectable Rn-222 activity concentration with the equipment and conditions used in this study is around 12.5 kBq/m(3). It can easily be lowered below 1 kBq/m(3) if larger foils and low-background IS analyzers are used. Since the method does not require air sampling the depth distribution of Rn-222 in the soil is unperturbed by the sampling. The spatial distribution and the maximum measurement depth are set by the distance between the holes and the depth to which the rod can be fixed into the ground. Results from in situ applications of the method in terrains with high Rn-222 in soil-gas are reported, which demonstrate the feasibility and the usefulness of the proposed approach.