Page "Cathode ray tube" Paragraph 18

CRTs can emit a small amount of X-ray radiation as a result of the electron beam's bombardment of the shadow mask / aperture grille and phosphors.

The amount of radiation escaping the front of the monitor is widely considered unharmful.

The Food and Drug Administration regulations in are used to strictly limit, for instance, television receivers to 0. 5 milliroentgens per hour ( mR / h ) ( 0. 13 µC /( kg · h ) or 36 pA / kg ) at a distance of from any external surface ; since 2007, most CRTs have emissions that fall well below this limit.