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Aluminium's is 75.2 GPa; copper's 137.8 GPa; and mild steel's is 160–169 GPa.

Thorium's melting point of 1750 °C is above both those of actinium (1227 °C) and protactinium (1568 °C).

Its first applications were developed in the late 19th century.

Thorium's radioactivity was widely acknowledged during the first decades of the 20th century.

Meanwhile, a government paper setting out Britain's stance in the Brexit negotiation fired off the same warning stressing that the UK has the right 'to return radioactive waste . The plutonium is currently stored as powder in flasks while under heavy guard.

A new plant would have to be built to either recycle the material or process it so oit can be returned safely as waste.

In the second half of the century, thorium was replaced in many uses due to concerns about its radioactivity.

Thorium was formerly used as an alloying element in TIG welding electrodes, as a material in high-end optics and scientific instrumentation, and as the light source in gas mantles, but these have become marginal uses.

It was found to be carrying a radiation level of 13,000 becquerel per kilogram (Bq/kg) - the limit set by Sweden's Food Agency for safe consumption is 1,500 Bq/kg.'This is the highest level we've measured,' Ulf Frykman, an environmental consultant who tests radiation levels in game meat, told SVT.

The animals themselves do not suffer many side effects from the radiation though it slightly increases cancer risk in humans who eat the meat.

Mr Frykman said that just 17 per cent of samples he examined so far this year were below the Food Agency's maximum level.

Thorium is an electropositive actinide whose chemistry is dominated by the 4 oxidation state; it is quite reactive and can ignite in air when finely divided. The most stable isotope, It is estimated to be over three times more abundant than uranium in the Earth's crust, and is chiefly refined from monazite sands as a by-product of extracting rare-earth metals.

Thorium was discovered in 1829 by the Norwegian amateur mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jacob Berzelius, who named it after Thor, the Norse god of thunder.

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