PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
Radon radiation detector. This device is designed to detect the radiation emitted by the radioactive gas radon. Radon occurs naturally, and is found in small quantities in the atmosphere. It is produced by the decay of radioactive isotopes in the Earth's crust. In some locations, radon gas rising from the ground can build up to harmful levels. The radiation emitted by the radon etches marks in a plastic polymer detector material (PADC). The detector is left in a house for a period of time, after which the marks are examined to calculate the amount of radon that is present. This detector, from UK's Health Protection Agency, is designed to be clipped to an item of clothing to record an individual's level of exposure to radon.
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