Unfortunately, this may not be true. My father, RIP, was present during the A-bomb tests at Bikini Atoll. He was one of the guys you always see with the "welding goggles" on standing at the rail of the ship watching the ever expanding mushroom cloud form above the Pacific Ocean. He watched 2 of the bombs from as close as 20 miles away. Remember, the Army used soldiers as test subjects even before this took place.

Now I understand that those nukes are firecrackers compared to the nukes that are in use now. What if you are not in the primary blast area what then?