X-rays from Color Television Receivers

Abstract

The main sources of leakage X-rays from a color television receiver are a cathode ray tube and a shunt regulator valve, 6 BK 4. As to each radiation from these devices manufactured in Japan, observations were carried out on the energy distribution, the geometrical distribution, the dose rate level and its correlation to beam current or applied voltage. Radiations from completed television receivers were also investigated. The radiation levels from the both sources showed a significant difference among individual products. Then a method has been proposed to estimate the percentage of television receivers which should give leakage radiation beyond a certain dose rate level. It has been found that the shunt regulator valve gives a high level of leakage radiation and this should be shielded more cautiously than the cathode ray tube. It is rather easy to make the dose rate level below the maximum permissible limit by means of a simple shielding, for the radiation is mainly composed of very soft ccmponents.