Intwaro kirimbuzi zimaze gukoreshwa inshuro ebyiri mu mateka y’isi. Inshuro ya mbere zakoreshejwe ni igihe Leta Zunze Ubumwe z’Amerika zarimburaga Hiroshima na Nagasaki ku itariki 8 Kanama 1945. Icyo gihe I Horoshima hapfuye 140,000 naho I Nagasaki hapfuye abasaga 74,000. Ikigo Union of American Scientists and the International Arms Control Association kivuga ko ibihugu icyenda gusa nibyo bifite intwaro kirimbuzi.

Birimo Leta Zunze Ubumwe z’Amerika Uburusiya,Ubushinwa,Ubufaransa,Ubwongereza, Ubuhinde, Pakistan,Ubufaransa, Koreya ya Ruguru na Israel. I Burayi ibihugu bibiri byonyine nibyo bikora intwaro kirambuzi.

Ishusho y'igisasu kirimbuzi cya Uranium

Ni mu gihe Afurika nta gihugu nta na kimwe gikora izo ntwaro kirimbuzi. Ubutare bwa Uranium nibwo bukoreshwa mu gucura intwaro kirimbuzi.