A study has been undertaken of radon levels in an abandoned metalliferous mine in South‐West England. Measurements have been taken in Gunnislake Old Adit using a variety of techniques. Radon gas levels of between 30,000Bq m‐3 and 69,000Bq m‐3 have been noted in this mine, associated with radon progeny levels of between 2.6 and 4.8 working levels. These radon levels pose a health risk for regular visitors to such mines.
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