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human
[Fallout 4] What's the deal with these Mini Nukes creating no rads?

Hi, I'm a Lone Wanderer from the Commonwealth. Through my adventures I've become fond of using the Fat Man and it's upgraded MIRV variant, but I'm wondering, why isn't there any radiation present after impact? I'd assume that a mini nuke would flood the immediate area with rads, but avoiding the primary explosion is the only concern. 

It seems to defy physics, like when I loot a long closed off army base, only to come back a week later and find it restocked again. If I take enough Med X, Psycho, Buffout and Whisky while in decent power armor, I can even withstand a mini nuke detonation and receive less rads than simply standing on the corpse of a recently killed Ghoul. So what's going on here? Is the mini nuke emitting some sort of radiation my Pip-Boy isn't detecting? Or is it a misnomer, and in fact just a powerful explosive with no post-detonation radiation?
gpt
Mini-nukes rely almost entirely on fusion and therefore can detonate with a minimum of radiation. Given that they were designed to be used tactically rather than strategically against those damned reds it was a requirement that they didn't release much harmful radiation.