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    Heat generated by the most dangerous nuclear waste could be exploited to bury it permanently and irretrievably in the Earth's crust, geologists are claiming. But waste-management experts warn that sound science is not enough to bring about the safe disposal of high-level waste.

    High-level waste packed into boreholes drilled 5 km deep in solid granite would generate so much heat that it would melt the surrounding rock, which would then engulf it. As the deadly waste cools, the rock would eventually re-solidify, encasing it, suggests Fergus Gibb of the University of Sheffield, UK.

    "Granite is the ideal material to form a coffin for nuclear waste - a coffin that will survive for millions of years," says Gibb. Granite is one of the most erosion-resistant rocks on Earth; some are half-a-billion years old.

    Geologists had doubted that granite would return to its ultra-durable state if it cooled too quickly - most granite formed after cooling for hundreds of thousands of years. Gibb and colleague Philip Attrill showed in the lab that melted granite returns to its original form within weeks at pressures similar to those at a depth of 5 km.
    (Source: http://www.nature.com/nsu/030811/030811-4.html)

    แก้ไขเมื่อ 28 ธ.ค. 46 20:26:39

    จากคุณ : tidtee_1 - [ 28 ธ.ค. 46 20:25:57 ]