The Sixth Ring
The half-life of PU-240 is 6,560 years. The half-life of PU-239 is 24,110 years. Waste materials remain radioactive for 24,110 years after they have been stored in the ground. After about five to six thousand years, they have decomposed to represent weapons grade plutonium. The United States’ government’s plan for dealing with this problem, as of now, is to develop a better plan before several thousands of years pass. I included the standard warning sign for radioactive waste material storage areas, which seems to be saying, run.