Half life of plutonium 239 is 24,100 years.
Half life of plutonium 238 is 88 years.
Definition of half -life : The time taken for the radioactivity of a specified isotope to fall to half its original value.
The half-life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years
Read Walter Russell "Atomic Suicide". Radioactive materials are not meant to be brought to the surface of the earth. It is meant to reside deep underground where it should be. All these radioactive materials brought to the surface of the earth are depleting the oxygen in the ozone area.
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