My requirements for a Dive watch is that it can withstand at least 200 meters depth, have a Swiss automatic movement, Sapphire crystal, and have a band that can adjust for daily wear, wetsuit or drysuit.
If it can't do all of the above, it does not go on my wrist.
By the way, regarding radiation exposure, Pilots get quite a dose because of elevation (lack of atmospheric protection), time, distance, shielding --etc.