A claim: radioactivity can be reduced by bacteria. See this link: http://pages.csam.montclair.edu/~kowalski/cf/402vysotskii.html Radioactive Cs-137 is mostly responsible for meltdowns of spent reactor fuel. Ludwik Kowalski (see Wikipedia) .
Most of the past work with bacteria focuses on making the radioactive element insoluble in water through a chemical reaction and then concentrating it somewhere else (i.e. at the bottom of a lake or sea). Really interesting if groundbreaking work comes out of Montclair State. http://www.sciencedaily.com/releases/2009/09/090908193444.htm
Thank you for the link. I sent her an email message asking for an update. I will post the update, when it arrives. Ludwik Kowalski (see Wikipedia) .