磷石膏

磷石膏是人們用磷礦石製造化肥時所形成的副產品。它的主要成分是石膏（CaSO4-2H2O），即硫酸鈣二水合物。雖然石膏是建築業中廣泛使用的原材料，但由於磷石膏含有天然存在的鈾、釷及其子體同位素鐳、氡、釙等，因而具有微弱的放射性，所以一般人們不使用磷石膏，而是將其無限期儲存起來^[1]^[2]。

Phosphogypsum stack located near Fort Meade, Florida.

參考文獻

^ Ayres, R. U., Holmberg, J., Andersson, B., "Materials and the Global environment: Waste Mining in the 21st Century", MRS Bull. 2001, 26, 477. doi:10.1557/mrs2001.119
^ Tayibi, Hanan; Choura, Mohamed; López, Félix A.; Alguacil, Francisco J.; López-Delgado, Aurora. Environmental Impact and Management of Phosphogypsum. Journal of Environmental Management. 2009, 90: 2377–2386. PMID 19406560. doi:10.1016/j.jenvman.2009.03.007.

[Ayr-1] Ayres, R. U., Holmberg, J., Andersson, B., "Materials and the Global environment: Waste Mining in the 21st Century", MRS Bull. 2001, 26, 477. doi:10.1557/mrs2001.119

[Taylor-2] Tayibi, Hanan; Choura, Mohamed; López, Félix A.; Alguacil, Francisco J.; López-Delgado, Aurora. Environmental Impact and Management of Phosphogypsum. Journal of Environmental Management. 2009, 90: 2377–2386. PMID 19406560. doi:10.1016/j.jenvman.2009.03.007.

[1]

[2]