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The major part of the radiation dose, which humans receive from natural radioactivesources, originate due to radon and its decay products inhalation. Indoor radon poses asubstantial threat to human health when build-up occurs in confined spaces such ashomes, mines and caves. The health risk increases with the duration of radon exposureand it is also proportional to the radon concentration. Tourist caves are a case of specialenvironmental conditions that may be affected by high radon concentration. The aim ofthe wo...