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In page Nuclear power debate:

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For instance, over a timeframe of thousands of years, after the most active short half-life radioisotopes decayed, burying U.S. nuclear waste would increase the radioactivity in the top 2,000 feet (610 m) of rock and soil in the United States (100 million km2 or 39 million sq mi)[citation needed] by approximately 0.1 parts per million over the cumulative amount of natural radioisotopes in such a volume, although the vicinity of the site would have a far higher concentration of artificial radioisotopes underground than such an average.[15][broken link]