Deep burial in granite might be a solution for a depository for radioactive material.
Nuclear waste: Bury nuclear waste down a very deep hole, say scientists, Science Daily April 14, 2015 Source: University of Sheffield
Summary:
Technologies that will enable nuclear waste to be sealed 5 km below the Earth’s surface could provide a safer, cheaper and more viable alternative for disposing of high level nuclear waste. Scientists at the University of Sheffield calculate that all of the UK’s high level nuclear waste from spent fuel reprocessing could be disposed of in just six boreholes 5km deep, fitting within a site no larger than a football pitch Landfill
The concept — called deep borehole disposal — has been developed primarily in the UK but is likely to see its first field trials in the USA next year. If the trials are successful, the USA hopes to dispose of its ‘hottest’ and most radioactive waste — left over from plutonium production and currently stored at Hanford…
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Vernon Radiation Safety 