A new method for the determination of geophysical parameters by radon concentration measurements in bore-hole.
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.
Papp
B
B
Department of Atomic Physics, Eötvös University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary. pappboti@ludens.elte.hu
Deák
F
F
Horváth
A
A
Kiss
A
A
Rajnai
G
G
Szabó
Cs
C
D005844:Geology; D055904:Meteorology; D009584:Nitrogen / Q000737:chemistry; D011886:Radon / Q000032:analysis*
D009584:Nitrogen; D011886:Radon