High Quality Content by WIKIPEDIA articles! Thorium is a naturally occurring, slightly radioactive metal. It is estimated to be about three to four times more abundant than uranium in the Earth's crust.Thorium was successfully used as an alternative nuclear fuel to uranium in the molten-salt reactor experiment (MSR) from 1964 to 1969 to produce thermal energy, as well as in several light-water reactors using fuel composed of a mixture of 232Th and 233U, including the Shippingport Atomic Power Station (operation commenced 1977, decommissioned in 1982).

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