Employee exposures to 222Rn and 220Rn were measured in three Commonwealth fish hatcheries using specially designed personal dosimeters to determine whether remediation might be necessary. Employees utilizing the hatch house would wear the dosimeter and keep track of their time in the hatch house. Area detectors were also deployed full time in each hatch house. Exposure measurements were compared to U.S. Nuclear Regulatory Commission, U.S. Environmental Protection Agency, and Occupational Safety and Health Administration exposure limits. All measured employee exposures to 222Rn and 220Rn were very low and well below currently established regulatory limits. However, hatch house radon concentrations are significantly elevated above the U.S. Environmental Protection Agency residential guideline of 148 Bq m−3.
* Pennsylvania Department of Environmental Protection, Bureau of Radiation Protection/Radon Division, 400 Market Street, Harrisburg, PA 17101; † New York University, School of Medicine, Department of Environmental Medicine, MSB C C-90, 550 First Avenue, New York, NY 10016.
For correspondence contact: Robert Lewis, Pennsylvania Department of Environmental Protection, Bureau of Radiation Protection/Radon Division, 400 Market Street, Harrisburg, PA 17101, or email at email@example.com.
(Manuscript accepted 16 August 2009)