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I've never heard of radioactive dust in TV's...the only radiation is a low level of x-rays produced by High voltage rectifier and regulator tubes. The metal shielding around these tubes is enough to contain the x-rays, so that an ordinary user is protected from them. There were apparently some h.v. rectifier tubes which actually had a lead coating on them for x-ray shielding, although I have never seen them.
I believe most HV rectifier and regulator tubes, also picture tubes, have leaded glass to control x-rays. The only time I have heard of toxic dust is in some types of microwave tubes such as magnetrons, which may contain beryllium? which is said to be very toxic.
Modern TV's have no HV rectifier tubes, and have x-ray protection circuits to shut down the HV if it goes high enough to produce x-rays in the picture tube.
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