If you go to the web site, (actually a very good one) linked at the top of this article, Cohen addresses that in response to a letter commenting on this article. He explaned that he was using both 'official' government standards in compiling this list as opposed to reality. The linear 'no risk threashold' is still the government standard which causes large sums of money to be wasted that could be better spent on other serious health problems. Cohen himself published an article on the potential for a 'positive LLE' for low level radiation exposure.