Jim Conca, a scientist who worked at the facility from 2000 to 2010, told the newspaper he believes a change from non-organic to organic litter caused a chemical reaction inside a waste drum, releasing the radioactive isotopes.
Read more: hosted.ap.org
Comforting to know we have such highly advanced technology as cat litter, that protects us from radiation sickness. I hope they get that litter changed.
What the heck did I just read?