betalight

常见例句

• 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，但发光性却非常可靠。
• The lifetime of a betalight is limited by the half-life of the tritium gas (12.3 years);
  尽管玻璃气室的破裂会释放其中装有的放射性氚气体，但是在正常使用期间并不会造成对外的放射。
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