Handheld nuclear bombs are not particularly Fallout imho. The nuclear explosion in Fallout is a popular 50's (not that it’s changed that much) idea of huge devastation that might just end all life on the planet if there's any decent number of them. You know, the kind you go blind looking at, produces lots of Fallout and turns the general area into a wasteland?
Not some bomb you can throw a couple of meters away to kill some beastie.
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