Answer:
Cathode ray tubes are evacuated glass tubes that have two electrodes and are used to "excite" electrons, forcing them to release photons, or particles of light. They are not radio active, they are just electric.
They can, however, emit X-rays, but only during operation, and only with very high accelerating voltages.
Domestic (i.e. television) CRTs are designed to emit zero/very low levels of X-ray radiation.