LUCAS JOSE PEREIRA DA COSTA
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Artigo IPEN-doc 23032 Phosphogypsum recycling in the building materials industry: assessment of the radon exhalation rate2017 - CAMPOS, M.P.; COSTA, L.J.P.; NISTI, M.B.; MAZZILLI, B.P.Phosphogypsum can be classified as a Naturally Occurring Radioactive Material (NORM) residue of the phosphate fertilizer industry. One of the main environmental concerns of its use as building material is the radon exhalation. The aim of this study is to measure the radon exhalation rate from plates and bricks manufactured with phosphogypsum from three installations of the main Brazilian producer, Vale Fertilizantes, in order to evaluate the additional health risk to dwellers. A simple and reliable accumulator method involving a PVC pipe sealed with a PVC pipe cover commercially available with CR-39 radon detector into a diffusion chamber was used for measuring radon exhalation rate from phosphogypsum made plates and bricks. The radon exhalation rate from plates varied from 0.19 ± 0.06 Bq m 2 h 1, for phosphogypsum from Bunge Fertilizers, from 1.3 ± 0.3 Bq m 2 h 1, for phosphogypsum from Ultrafertil. As for the bricks, the results ranged from 0.11 ± 0.01 Bq m 2 h 1, for phosphogypsum from Bunge Fertilizers, to 1.2 ± 0.3 Bq m 2 h 1, for phosphogypsum from Ultrafertil. The results obtained in this study for the radon exhalation rate from phosphogypsum plates and bricks are of the same order of magnitude than those from ordinary building materials. So, it can be concluded that the recycling of phosphogypsum as building material is a safe practice, since no additional health risk is expected from the radiological point of view.Resumo IPEN-doc 15690 Randon exhalation from phosphogypsum bricks2010 - COSTA, LUCAS J.P. da; CAMPOS, MARCIA P. de; NISTI, MARCELO B.; MAZZILLI, BARBARA P.Phosphogypsum can be classified as TENORM and one of the main environmental concerns of its use is the radon exhalation from this material. The recycling of the phosphogypsum is very important from the socialeconomic point of view and also regarding environmental preservation. A possible way to reuse of phosphogypsum is the manufacture of building materials. The aim of this study is to evaluate the radon exhalation from phosphogypsum bricks used at houses construction. A practical approach to measure radon exhalation rates directly from the surface of the material is to allow radon to build up in a container over time. The device used to this practical radon measuring are called accumulator. In this study a hermetically closed glass can had been used as the accumulator. The phosphogypsum brick and a diffusion chamber with CR-39 were enclosed inside the accumulator. The exhalation rate was determined through the radon concentration at accumulator. It were assessed the radon exhalation rate from bricks manufactured with phosphogypsum from different origins.