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An experimental method for measuring the radon-222 emanation factor in rocks.


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Mot de passe :

C. Ferry, , P. Richon, A. Beneito, J. Cabrera and J. -C. Sabroux Radiation Measurements - Volume 35, Issue 6, December 2002, Pages 579-583.

Type de document > *Article de revue

Mots clés > études environnementales radon, méthode de mesure, radon

Unité de recherche > IRSN/DEI/SARG/LERAR

Auteurs > CABRERA Justo, SABROUX Jean-Christophe

Date de publication > 15/12/2002

Résumé

Abstract An experimental method, based on a 21-day accumulation technique, is proposed for measuring the radon-222 emanation factor in undisturbed consolidated materials. The leakage rate is determined from the form of the radon growth curve in the measurement chamber. It was comparable to the radon decay. In order to obtain the "true" radon emanation factor, the thickness of the sample must be less than the radon diffusion length in the porous material. The method was used to measure the radon emanation factor in water-saturated claystones (argillites). The radon emanation factor, determined from experiments on a rock sample with a thickness of 5 mm, was 15%, a value typical for this kind of material.