40 times is U-238 unsourced webpage at the Argonne National Labs web.ead.anl.gov/uranium/guide/facts/ http://web.ead.anl.gov/uranium/guide/facts Uranium Facts Uranium Quick Facts 16,000 tons of coal or 80,000 barrels of oil http://web.ead.anl.gov/uranium/guide/facts/ http://web.ead.anl.gov/uranium/guide/facts/ 16,000 tons of coal or 80,000 barrels of oil 16,000 tons of coal or 80,000 barrels of oil 16,000 tons of coal or 80,000 barrels of oil Yup. 16,000 tons of coal or 80,000 barrels of oil "Uranium Quick Facts" Argonne National Laboratory 16,000 tons of coal or 80,000 barrels of oil Uranium Quick Facts http://web.ead.anl.gov/uranium/guide/facts/ web.ead.anl.gov... 16,000 tons of coal or 80,000 barrels of oil http://web.ead.anl.gov/uranium/guide/facts It's not