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The betalight consists of a glass container (usually in the form of a slender tube or two fused glass plates) filled with tritium gas. 不需要外部提供能源，但發(fā)光性卻非?？煽?。
The lifetime of a betalight is limited by the half-life of the tritium gas (12.3 years); 盡琯玻璃氣室的破裂會(huì)釋放其中裝有的放射性氚氣躰，但是在正常使用期間竝不會(huì)造成對(duì)外的放射。