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Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry. In Brazil, three main phosphate industries are responsible for the production of 5.5 × 106 metric tons of PG per year, which is stored in stacks. Part of this by-product can be reused to improve fertility of agricultural soils. For its safe application, it is necessary to characterize the impurities (metals and radionuclides)...