Most earth and soil nuke detonations had MUCH less. Heck the US set off several tests in Nevada, some of which were not as contained as they wanted. Most of the Midwest and some of the east got fall out from those.
Several like Bikini atoll test were done just above the atoll and were air bursts. France also did several Pacific tests, and Russia did a few in the Sakhalin islands, including IIRC, a 100 mega ton air burst. That used to be viewable online you-tube I believe, and probably still is.
To get a burst with particulate fall out you usually must get particulate matter into the air. The ones suggesting using a nuke probably are NOT thinking along the lines of our tests in Nevada/New Mexico etc... A fractional KT would barely put anything in the air. Minimal to no wave.
Aluminum foil hats NOT needed this weekend.
Oh silly, the leakage from Three Mile Island couldn’t hold a candle to what is emitted from the tiniest nuclear explosive device ever tested on the earth. People keep wanting to compare it to the Chernobyl disaster and it’s like comparing a lightning bug to lightning.