I live in a rural area. Unless they miss the big city they were aiming for (a definite possibility) and hit little old us, we shouldn’t be surrounded immediately by high levels. Fallout is the main reason I want a geiger counter, especially for detecting contaminated surface water (and fish and livestock) long after outdoor background levels are tolerable.
I got one from Amazon about ten years ago that was for basic (think middle school) detection. I also have one of the old yellow monsters from the Civil Defense days. I guess it would be prudent to test them.
I live ten miles from an old SAC base that is home to a bunch of C5s. I always figured we were good for three or four, so nuke prepping was kind of silly. It’s likely the thermo part of thermonuclear will get me before the uranium does.