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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.
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‘이준석-전한길 끝장토론’ 본 장동혁 “당 TF 구성해 선거 재설계”
But there has been some energetic campaigning for change by high-profile figures, including Sir Chris Hoy, who has terminal prostate cancer, and Lord David Cameron, who recently revealed he'd been treated for it.