Think of it like spray paint. If u are standing in front of a wall and some one spray paints the entire wall with you infront of it, the moment u step away the only part unpainted is where you were blocking the wall. That simple, but more chemical like. Death is imminent.
For those who absolutely have no idea wtf this is, intense radiation leaves a shadow, and the most intense radiation release was the 2 atom bombs back in 1945 in Japan. A kid was playing with a skipping rope when she was exposed to such intense radiation, and it caused a shadow of her at that time to stick to the wall there.
