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Radon emits alpha-ionising radiation which has cytotoxic (cell damaging) and genotoxic (DNA damaging) effects. Because of this, radon has been included in the environmental carcinogens recognised by the World Health Organization (WHO).
Measuring external radiation fields ensures that radiation levels are as low as reasonably achievable (ALARA) in the community, especially in areas where radioactivity from industrial activities makes an impact.
Radon comes from the normal decay of uranium found in rocks, soil and water. From the ground it goes up into particles that a human can breathe.