Abstract
Soft beta-particles emitted by tritiated polystyrene are impinged upon a copper activated zinc sulphide phosphor to provide self-sustained light sources for nocturnal illumination of watch dials and timepieces, product advertisements, telephone numbers, exit signs etc. For this purpose phenylacetylene was partially reduced with tritium in di-isopropyl ether medium using 10% Pd/CaCO3 poisoned with quinoline to give styrene. Styrene was polymerized to polystyrene by g-radiation (200 kGy dose). The copper activated zinc sulphide phosphor was then coated with that tritiated polystyrene to give self-sustained light sources.
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