There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
厦门的年夜饭市场火爆。这道“龙腾四海小青龙”的龙虾头被固定在盘中，被家人们调侃为“老演员”，还要留给下一桌用。南方周末记者 黄思琪/摄
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