I was talking with a friend of mine that repairs older televisions and tube radios; he told me about something that I'm not sure of. I asked why you find some greasy black dust in some older TV sets, what exactly was the dust. He said " Don't ever touch the dust inside a TV set, It's radioactive, Very Dangerous". I do not know if he was trying to joke around with me, or if he was serious. He went on to say " a TV set is the most dangerous item in someone's home, that is why the coat the back of the backs with lead". Is he feeding a line of Bull poop?