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In page Cavity magnetron:
"Contrary to popular belief, most consumer magnetrons use aluminium oxide (alumina) instead of the much more dangerous beryllium oxide for the insulators.[2] Alumina is considerably cheaper for consumer magnetrons and if broken does not carry the same health risks of broken beryllium oxide. Some higher power magnetrons and very old microwave ovens do use beryllium oxide[citation needed] and, at least on modern magnetrons, it is typically labeled with a beryllium oxide warning.[citation needed]
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