DDX, are you sure Uranium 235 would survive for such a period of time and in quantity enough that the alpha waves would be enough to kill someone? I do understand that it's incredibly poisonous if ingested, but 5 hours?
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. Confucius