The Influence of Finishing Materials on Radon Exhalation from Concrete with Phosphogypsum Additives

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Touchaphong Srisuwan
Paitoon Wanabonges
Chalermwat Tantasavasdi


This research is conducted to investigate the amounts of radon gas diffusing from various types of PG-containing concrete slabs which use 4 of the most commonly used finishing materials in Thailand: slab surfaces with plaster, surfaces with plaster and covered with oil/emulsion paints or with wallpaper, compared with that emanating from concrete slabs without PG. It was found that the concrete slab with PG additives emitted the highest amounts of radon, with an exhalation rate of 10.45 Bq m-2 h-1 that is 34 times that of normal concrete. Obviously, the use of finishing materials on surfaces can be a simple way to inhibit radon exhalation rates. Slabs covered with plaster and emulsion paint were the most effective (with a 48% reduction). Considering a concrete room of typical size through CFD simulation, the results revealed that the most exposure to radon occurs in the model using PG-containing concrete slabs. Applying some common covering materials to internal surfaces can be a simple and economical way to mitigate the indoor radon concentrations and the corresponding annual effective dose.


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