An approach to the subslab depressurization remedial action in a high Rn concentration dwelling |
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Authors: | JJ Llerena D Cortina I Durán R Sorribas |
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Institution: | Laboratorio de Análisis de Radiaciones (LAR), Departamento de Física de Partículas. Grupo Experimental de Núcleos y Partículas (GENP), Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain |
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Abstract: | Galicia (NW Spain) is a radon-prone area in the Iberian Peninsula. Measurements were carried out at a rural dwelling, with an annual average of radon concentration over 4000 Bq m−3 and a maximum of 9000 Bq m−3, found during a radon screening campaign held in the Autonomous Community of Galicia. We performed a detailed study to identify the main contamination source and the behaviour of the radon concentration, in which a linear dependence with temperature was verified, once corrected for relative humidity. We used different passive methods (charcoal canisters and two types of etched track detectors) as well as a radon concentration monitor that provided continuous measurement. Subsequent to this characterization, and in order to reduce the high radon concentration, a remedial action was developed using different passive and forced ventilation methods. A modified subslab depressurization technique was found to be the most effective remedy, providing a radon concentration reduction of around 96%. This method also has the advantages of being inexpensive and reliable over time. |
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Keywords: | Environmental radioactivity Radon-prone area Remedial action Radon Charcoal canister Etched track detector Continuous measurements LR-115 CR-39 Alphaguard |
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