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Radon in mines and caves

Geological conditions in the South West mean some areas have high levels of radon.

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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Environmental Protection


01454 868001

Department for Environment and Community Services
PO Box 299
Civic Centre
High Street
BS15 0DR