For centuries miners have used mercury to trap particles of precious metals. Artisanal and small-scale gold miners used an estimated 1,400 metric tons of mercury in 2011. About one-third of the mercury used is believed to go into the air while the rest goes into soils and waterways.
More than 80 million people in the US get computed Tomography (CT) scans every year. This article investigates possible cancer risk from their radiation exposure.