The bunker does not have to be all that deep. unless of course its right at ground zero. All the radiation illness will be from the fallout floating around. Way WAAAAY back in the day (20 yrs or so) while in the USMC I was schooled in the fun of predicting fallout patterns and detection of a-z bio/chem agents. Lets just say that for a nuclear war we are all pretty much screwed. no hole is deep enough unless you've created a fully self sustained eco system. BUT! for those of us that are totally fukoshima'd (to early?) the first thing to do is to filter the air you breath. NO GAS MASKS! the dust is radioactive and collects in the filters right around your face, not good. a wet bandanna washed frequently is actually the best believe it or not.
Basically anything that ingests the fallout dust is going to have raised levels of radiation. Initial blast exposure will be dissipated by the atmosphere(10-20 miles if I remember, been a long time) Then its a direct line of site thing where a ditch will let the pulse of radiation pass over you. There will be the initial blast that will blind you if you look into it, then once the O2 is all burned up the blast wave reverses as the "fire" sucks all the air (and trailers parks nearby) back to the center for a re-ignition. this cycle repeats but no real way to tell how many waves back and forth unless you know the bomb and delivery. holywood only gets the initial flash and bang right.
The main types of detonation are aerial (above ground) surface(at ground level) and sub-surface (below ground) each with increasing levels of fallout.
The first, aerial, is the cleanest.
It flattens the target and produces little fallout. the concussion is the aim of that type.
The surface type of blast starts to get a little messy with irradiating everything thats vaporized and spreading it to the wind to take to everyone down wind.
The subsurface type produces the most fallout and sends debris higher and in more quantity than the other two kinds of similar yield.
As to the rad counts and what they do to you I cant say off hand since its been so long since I had to do that kind of math.
with the size of what we have and what the soviets made (they werent too concerned with accuracy BTW) I am confident there will be no one worrying about rad counts and fallout patterns. The "OFFICIAL" sizes are no where near what in all probability have been developed.
I'm of the mind that the grid will go down and cause the fan fouling but if it is nukes I'm not going to bother worrying. I really hope it wont be a super bug they've developed that does us in. thats really gonna be nasty to get through and also no way to protect against. I guess that makes me a "gridder" Lol. That will be a blessing. good luck to us all