Per megawatt: see <a href="http:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;coal-ash-is-more-radioactive-than-nuclear-waste&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;coal-ash-is-more-r...</a>