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Radon in mines and caves

Radon levels underground depend largely on ventilation rates.  High concentrations can often occur when the temperature outdoors is high.

The former National Radiological Protection Board and other organisations have carried out measurements in some caves and mines. Average concentrations in the summer months were found to be typically 10,000 becquerels per cubic metre. Levels as high as 800,000 becquerels per cubic metre have been measured.

The people most at risk from radon in mines and caves are members of caving groups who are regularly underground for several hours.

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