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===Meaning===
[[File:IonisingRadiationSymbol.png|right|300px|thumb|The [[hazard]] symbol found on containers of [[Nuclear Waste|nuclear waste]].]]
[[High Level Nuclear Waste|High level nuclear waste]] is [[Nuclear Waste|nuclear waste]] with a many different which extremely [[Unstable Isotope|unstable isotopesradioactive]] with different but will not remain so for more than a few decades due to a short [[Half Life|half lives]] and a high level of [[radioactivitylife]].
===About High Level Nuclear Waste===
: After around 50 years '''high level nuclear waste''' becomes [[Intermediate Level Nuclear Waste]].
: '''High level nuclear waste''' requires shielding to prevent [[irradiation]] of living [[organism]]s and containment to prevent [[Radioactive Contamination|contamination]] of the [[environment]].
: '''High level nuclear waste''' releases a lot of [[energy]] which increases the [[temperature]] of the [[material]] so it requires cooling to prevent it [[heating]] up so much that [[Melting|melts]] or catches fire.