The radiation from the bombs affected people by the destruction of stomach and intestinal fluids, destruction of bone marrow, and anemia killing most of the victims within 30 days. Even still today people are dying from the radiation of the bombs, so due to radiation Hiroshima and Nagasaki have become sights of the biggest mass murder events in history. In modern times the radiation effects pregnant women and gives some babies birth defects. How long the radiation will last and effect Japan is unknown, it could be a 100 years or even 100,000 years. Because this was the first event like this in history no one knows how long the effects will last on