In 2003 the Agency updated the estimates of lung cancer risks from indoor radon based on the National Academy of Sciences' (NAS) latest report on radon, the Biological Effects of Ionizing Radiation (BEIR) VI Report (1999). EPA worked closely with the Science Advisory Board (SAB), an independent panel of scientific experts, to determine how best to apply the risk models developed by the BEIR VI committee. The SAB's advice and recommendations were incorporated modifying and extending the methods and approaches used in BEIR VI to construct a single model yielding results midway between the results obtained using the two models preferred by the BEIR VI committee. The Agency's updated calculation of a best estimate of annual lung cancer deaths from radon is about 21,000 (with an uncertainty range of 8,000 to 45,000), which is consistent with the estimates of the BEIR VI Report. A single risk model also permitted the Agency to calculate a numerical estimate of the risk per unit exposure [lung cancer deaths per working level month (WLM)] which will be used to update estimated lung cancer risks from radon in various publications, including A Citizen's Guide to Radon.
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A PALEONTOLOGY LABORATORY APPROACH TO RADON HAZARDS, DETECTION, AND MITIGATION
Gavin McCullough
Arizona Museum of Natural History
Mesa, Arizona
Radon is a colorless, odorless radioactive gas that occurs as a product of radium or uranium decay. In recent years, radon has been identified as a serious health hazard in residential and industrial environments, the EPA estimating that about 20,000 lung cancer deaths are radon-related. Radon poses a risk of lung cancer to non-smokers, and a far greater risk of lung cancer to smokers. Recently the AZNMH tested its paleontology laboratory and storage vaults for radon, based on observations that the parent sediments contain uranium. After testing with store-bought radon detectors followed up by testing by an environmental/industrial safety company, we discovered that Pliocene fossils collected from southeastern Arizona are sources of elevated radon levels (above 4 pCi/L, the EPA “action level”). Immediate action included 24-hour active ventilation, simple dust control measures, and increased passive ventilation during work hours. The results of our action are that paleontology lab radon levels have steadily decreased at a rate of 0.10 pCi/L per week. In addition, we are scheduled to receive an industrial-grade ventilation system as part of a safety upgrade allowance. Radon detection is inexpensive and mitigation is not complicated, but health risks due to radon exposure can be severe. Radon testing should be emphasized as part of environmental safety regimes in laboratory and industrial situations that work with fossils, rocks, or create mineral dust as part of their work.
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