An interesting article by Blomberg on the continuing problem

"Abandoned medical scanners, food processing devices and mining equipment containing radioactive metals such as cesium-137 and cobalt-60 are often picked up by scrap collectors and sold to recyclers, according to the International Atomic Energy Agency, the UN's nuclear arm"

http://www.bloomberg.com/apps/news?pid=20601109&sid=aKNgo0CVJg9s&refer=exclusive