226Ra and 228Ra in scale and sludge samples and their correlation with the chemical composition.
In order to contribute to a future waste management policy related to the presence of technologically enhanced natural occurring radioactive material (TENORM) in the Brazilian petroleum industry, the present work presents the chemical composition and the (226)Ra and (228)Ra content of sludge and scales generated during the offshore E and P petroleum activities in the Campos Basin, the primary offshore oil production region in Brazil. The (226)Ra and (228)Ra content on 36 sludge and scales samples were determined by gamma-spectrometry. Based on X-ray diffractometry results, a chemical analysis schema for these samples was developed. The results have shown that scales are 75% barium and strontium sulfates, with a mean (226)Ra and (228)Ra content of 106 kBq kg(-1) and 78 kBq kg(-1), respectively. On the other hand, sludge samples have a much more complex chemical composition than the scales. The (226)Ra and (228)Ra content in sludge also varies much more than the content observed in the scales samples and ranged from 0.36 to 367 kBq kg(-1) and 0.25 to 343 kBq kg(-1), respectively.
Godoy
José Marcus
JM
Instituto de Radioproteção e Dosimetria, Comissão Nacional de Energia Nuclear, Caixa Postal 37750, Barra da Tijuca, Rio de Janeiro, RJ, Brazil CEP 22643-970. jmgodoy@ird.gov.br
da Cruz
Rosana Petinatti
RP
D001464:Barium / Q000032:analysis; D001938:Brazil; D007220:Industrial Waste; D010578:Petroleum; D011886:Radon / Q000032:analysis*; D012016:Reference Values; D012037:Refuse Disposal / Q000379:methods*; D013324:Strontium / Q000032:analysis; D014961:X-Ray Diffraction
D007220:Industrial Waste; D010578:Petroleum; D001464:Barium; D011886:Radon; D013324:Strontium