estherau; Actual color computer monitors emit rather less X-rays than television screens; there is a high lead content in the back of the matrix that shields the user (and makes the bloody things so bad for landfills). That said, there is some Xray leakage, and it should be mentioned on the spec sheet for tha monitor. A TFT or LCD screen doesn't emit hard radiation whatsoever; your lightsource is high output fluroescent lamps, and the TFT panel basically opens and closes optical ports associated with the RGB color dots. From a radiation standpoint they are much safer over long exposure times (but that is in years, not days or hours). They are also more energy efficient.