title: A new method for the determination of geophysical parameters by radon concentration measurements in bore-hole.
abstract: We propose a new method to measure the (222)Rn concentration in a closed bore-hole and to use the results for estimation of the diffusion parameter and the average radium content of the surrounding geological formations. In a closed bore-hole, only several meters from the surface, the radon concentration is rather constant (in the +/-15% range) under different meteorological conditions. The inflow of radon gas, after removing the radon from the bore-hole by dry nitrogen, shows characteristic time-dependence, which is determined by the diffusion parameter for radon in the surrounding environment. The experimental data were well described by a straightforward model calculation. From the results estimate can be given for the diffusion parameter and for the average radium content of the surrounding geological formation.
authors.affiliation: Department of Atomic Physics, Eötvös University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary. pappboti@ludens.elte.hu
authors.forename: B
authors.initials: B
authors.lastname: Papp
authors.forename: F
authors.initials: F
authors.lastname: Deák
authors.forename: A
authors.initials: A
authors.lastname: Horváth
authors.forename: A
authors.initials: A
authors.lastname: Kiss
authors.forename: G
authors.initials: G
authors.lastname: Rajnai
authors.forename: Cs
authors.initials: C
authors.lastname: Szabó
mesh_terms: D005844:Geology; D055904:Meteorology; D009584:Nitrogen / Q000737:chemistry; D011886:Radon / Q000032:analysis*
chemical_list: D009584:Nitrogen; D011886:Radon