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|header1 = [[Alkali metal]]s |header4 = [[Alkaline earth metal]]s

...ve]] material enters the metal recycling process and contaminates [[scrap metal]]. ...ealedRadioactiveSources/pdfs/handout_scrap.pdf Reducing Risks in the Scrap Metal Industry], IAEA</ref> The best known example of this type of event is the [

...land vehicles or ships, skyjacking usually is not committed for robbery or theft. Most aircraft hijackers intend to use the passengers as [[hostage]]s, eith ...]] plays a major role in preventing hijackers. Screening passengers with [[metal detector]]s and luggage with [[x-ray]] machines prevents weapons from being