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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The 34-year-old, from Manchester, creates sculptures out of factory waste as part of her work as artist-in-residence with one of Lancashire's oldest manufacturing companies.，推荐阅读快连下载-Letsvpn下载获取更多信息
Khapung - who retired in November - has not replied to the BBC's request for comment.