The National Institute for Occupational Safety and Health (NIOSH) received a request for a health hazard evaluation to evaluate occupational exposure to magnetic fields generated by metal detectors located in various U.S. courthouses. Visitors entering federal courthouses today are checked for weapons and explosive devices using metal detectors. All federal courthouses use very similar metal detection eauipment. In this evaluation, a total of 52 walk-through style (denoted as arch in this report) and several types of handheld metal detectors were evaluated in federal courthouses located in 15 states over a 17-day period.
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