There's something rotten in radon carcinogenesis epidemiology

It is shown that the cancer risk from radon exposure as determined from miner data is completely inconsistent with the data on environmental radon, over predicting the risk by at least one or two orders of magnitude. This discrepancy is real, it is very large, and it cannot be ignored. It means either that most of the lung cancer among miners is due to causes other than radon, or that the linear-no threshold dose-response relationship for radiation carcinogensis seriously over-predicts risks at low doses even for alpha particles. For the Swedish miners, whose exposures were essentially in the environmental dose region, the former explanation is required