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==Key Stage 4==
===Meaning===
[[File:IonisingRadiationSymbol.png|right|300px|thumb|The [[hazard]] symbol found on containers of [[Nuclear Waste|nuclear waste]].]]
[[High Level Nuclear Waste]] is [[Nuclear Waste|nuclear waste]] with a many different [[Unstable Isotope|unstable isotopes]] with different [[Half Life|half lives]] and a high level of [[radioactivity]].