Assessment of X-radiation from television receivers

The possibility of predicting, at the design stage, the X-radiation properties of a particular receiver under development is achieved by establishing X-ray properties of cathode-ray tubes in terms of their spread, e.h.t., and beam current, and by defining properties of e.h.t. supplies in terms of mean potential, spread and internal impedance. The two sets of properties are allowed to act simultaneously and final results are evaluated statistically in terms of a number of receivers exceeding the present permissible dose-rate of 0.5 mr/h, the amount of X-radiation emitted in an extreme case and the amount of shielding required, if any. The specific cases quoted were taken from measurements on tubes and valves operated under laboratory conditions.