Little Boy was air burst 580m above the city, so most of the fallout traveled away into the atmosphere. There were many acute radiation poisoning deaths (thoug

Little Boy was air burst 580m above the city, so most of the fallout traveled away into the atmosphere. There were many acute radiation poisoning deaths (though there were far more deaths from the fire and the blast), and about a third of the survivors suffered radiation injuries that increased their risk of cancer, but there was very little to no long-term contamination of the area.