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Radioactivity warning symbol in smoke alarm

Radioactivity warning symbol in smoke alarm

C038/6823

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Credit

MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY

Caption

Radioactivity warning symbol in smoke alarm. Close up of the inside of an ionisation-type smoke alarm, showing a trefoil radiation symbol and details of the alarm's radioactive source. The radiation produced by this radioactive source ionises the air between two charged metal plates, causing a small flow of electricity. Smoke disrupts this, triggering the alarm. The labelling on this smoke alarm states that it contains 0.9 microcuries (Ci) of the radioactive element americium-241. This is given at right in a different unit, as 33,000 becquerals (Bq). The central circular grey area (with the symbol and contents information) is 24 millimetres in diameter.

Release details

Model release not required. Property release not required.

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