Actinides Long-lived fission product

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after cs , sr have decayed low levels, bulk of radioactivity spent fuel come not fission products actinides, notably plutonium-239 (half-life 24 ka), plutonium-240 (6.56 ka), americium-241 (432 years), americium-243 (7.37 ka), curium-245 (8.50 ka), , curium-246 (4.73 ka). these can recovered nuclear reprocessing (either before or after cs , sr decay) , fissioned, offering possibility of reducing waste radioactivity in time scale of 10 10 years. pu usable fuel in existing thermal reactors, minor actinides am, non-fissile , less-fertile isotope plutonium-242, better destroyed in fast reactors, accelerator-driven subcritical reactors, or fusion reactors.








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