Radioactivity warning symbol in smoke alarm

Radioactivity warning symbol in smoke alarm

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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.

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Keywords: 2018, 21st century, 241am, am, am-241, americium 241, americium-241, becquerals, bq, chemical element, chemistry, ci, close-up, curies, detail, fire safety, household item, ionisation, ionising, ionising ionisation smoke fire alarm detector radioactive material, ionization, ionizing, isotope, physical, physics, radiation, radiation symbol, radioactivity, safety, smoke alarm, technological, technology, trefoil

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