Phosphogypsum (PG), primary by-product from phosphoric acid production, is accumulated in large stock-piles which were active until 2010, when spills were banned. It is considered as NORM material that contains radionuclides from 238 U and decay series which are of most radiotoxicity. PG was valorized and/or recycled in a building material, sulfur polymer cement (SPC). The SPC-PG samples reach the international regulation to use in the manufacture of building materials without radiological restrictions, except the sample with the 50% of PG. Under normal conditions of ventilation the contribution to the expected radon indoor concentration is also below the international recommendation.
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López Coto, I., Mas, J.L., San Migel, E.G., Bolivar, J.P. and Sengugta D. (2009) A comparison between active and passive techniques for measurements of radon emanation factors. Applied Radiation and Isotopes, 67, 849-853. doi:10.1016/j.apradiso.2009.01.045
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