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January 11, 2005

Running Time: 00:55:33
Format: RealAudio (Requires free RealPlayer)

A new report by the National Academies' Board on Environmental Studies and Toxicology on the health effects of perchlorate, a chemical that in high doses can decrease thyroid function in humans and that is present in many public drinking-water supplies, says daily ingestion of up to 0.0007 milligrams per kilogram of body weight can occur without adversely affecting the health of even the most sensitive populations. That amount is more than 20 times the "reference dose" proposed by the U.S. Environmental Protection Agency in a recent draft risk assessment.

Associate Dean Research Development; Professor Department of Pediatrics, University of Colorado School of Medicine; and Executive Vice President for Academic Affairs, National Jewish Medical and Research Center, Denver