There will not be any persons subjected to long suffering from the initial radiation by the nuclear weapons of today. The bad news is that the reason why is that the weapons blast such a large hole or create such a large area of complete destruction that the initial radiation can't escape. That is to say the totally destructive blast extends beyond the range of the initial radiation. On the other hand, the survivors of Hiroshima and Nagasaki did not have much problem with fallout. The first major victims of fallout were some fishermen many, many miles downwind from the Bikini Island tests.
Fallout is a phenomenon much more associated with nuclear weapons.
Nevertheless, there was fallout in Southern Utah. As stated before, it was so slight it could not be detected by the most sensitive instruments. The specific matter of interest in southern Utah was the isotope 131 of iodine. This was absorbed by minute bacteria in the soil. In the process of filtering the iodine out of the soil the bacteria greatly concentrated it.