Radon breathing zone6/25/2023 However, the decay products of radon (radon daughters or progeny) are solid materials and are themselves radioactive. Most radon gas breathed in is immediately exhaled and presents little radiological hazard. This is untrue and, as shown on the map above, many parts of the country have high radon levels. Since granite contains relatively high levels of uranium many people think that it is only granite areas of the UK, such as the South West of England, that have high radon levels. Radon (more properly known as radon-222) comes from uranium which occurs naturally in many different types of rocks and soils. High concentrations are also found in some buildings because warm air rising draws radon from the ground underneath buildings to enter through cracks and gaps in the floor. The highest levels are usually found in underground spaces such as basements, caves and mines. ![]() The ground is the most important source as radon can seep out and build up in houses and indoor workplaces. Radon is a colourless, odourless, radioactive gas that occurs in rocks and soils, some building materials and water. Indicative map of radon affected areas in the UK What is radon?
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