Radon emanation coefficient study of a geological sample

Ozgumus, A. and Barillon, R. and Chambaudet, A. (1999) Radon emanation coefficient study of a geological sample. Il nuovo cimento C, 22 C (3-4). pp. 301-308. ISSN 1826-9885

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The radon atom can escape from the material it was formed in by direct recoil or by diffusion. It then enters either an inter or intra-granular space. Next, the radon atom can migrate by diffusion or convection in order to reach the atmosphere. The emanation coefficient is defined as the ratio between the number of radon atoms that escape from the matrix and the total number produced in the entire material. We propose to define a protocol in order to measure this emanation coefficient by a differential gammametric method. This method consists in determining the concentration of the short, half-life progenies of radon (essentially lead-214 and bismuth-214) through measuring their gamma-ray intensities in a hermetic cell before and after radioactive equilibrium. The first gamma measurement results give us the quantity of radon trapped in the solid matrix. A second analysis, after 13 days, gives the total production of the progenies, and thus the total radon in the sample. The measurements of a sample that is both dried and saturated are necessary to estimate the radon emanation potential. The influence of the fluid in the porous space is discussed in a theoretical way. This approach is applied to a geological sample and compared with the experimental results.

Item Type: Article
Additional Information: Paper presented at the “Fourth International Conference on Rare Gas Geochemistry”, Rome, October 8-10, 1997.
Uncontrolled Keywords: Geophysical aspects of geology, mineralogy, and petrology; viscosity, diffusion, and thermal conductivity; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra
Depositing User: Marina Spanti
Date Deposited: 10 Oct 2019 07:00
Last Modified: 10 Oct 2019 07:00
URI: http://eprints.bice.rm.cnr.it/id/eprint/13278

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