Unless you're using an old CRT (cathode ray tube) television set, there's no radiation in televisions. If anything, you should be concerned about distance from TV for vision problems. I've heard from pediatricians that screentime can cause vision problems in developing children. http://www.sciencefocus.com/qa/do-modern-lcd-televisions-emit-harmful-radiation
So we asked our pedia the same question. She said that it actually depends on the size of the tv or gadget. The bigger the screen is, the farther the kid should be. For regular size mobile phones, it should be a ruler. If it's a tab, should be 2 rulers. If the TV is 42", the kid should be 10 feet away.
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