Фото: Alaa Al-Marjani / Reuters
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Ian YoungsCulture reporter
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.
It is an "unprecedented" amount and array of items, which will yield new insights into Britain's past, says the Centre for British Archaeology.