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Grand Canyon's safety, health and wellness manager said tourists and employees may have been exposed to unsafe radiation from uranium ore stored in the the park's Museum Collections building. (Wikimedia Commons/Marine 69-71, see CC license below)

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Grand Canyon National Park investigating possible radiation exposure by tourists, employees

The National Park Service is conducting an investigation into whether employees and visitors at Grand Canyon National Park were exposed to unsafe levels of radiation after an employee raised the alarm Feb. 11.