Laba nooc oo waaweyn oo ah bambooyinka atomiga ah waxaa soo saaray Mareykanka intii lagu jiray Dagaalkii Labaad ee Adduunka: qalab ku saleysan uranium (magaciisa sirta ah "Little Boy") oo walxaha fissile uu ahaa uranium aad loo kobciyay, iyo qalab ku saleysan plutonium (fiiri tijaabada Trinity iyo "Fat Man") oo plutonium uu ka soo jeedo uranium-238. Qalabka Little Boy ee ku saleysan uranium wuxuu noqday hubkii ugu horreeyay ee nukliyeer ee loo adeegsado dagaalka markii lagu qarxiyay magaalada Hiroshima ee Japan 6dii Ogosto 1945.
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