磷石膏是人们用磷矿石制造化肥时所形成的副产品。它的主要成分是石膏(CaSO4-2H2O),即硫酸钙水合物。虽然石膏是建筑业中广泛使用的原材料,但由于磷石膏含有天然存在的及其子体同位素等,因而具有微弱的放射性,所以一般人们不使用磷石膏,而是将其无限期储存起来[1][2]

Phosphogypsum stack located near Fort Meade, Florida.

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