Small radiation leak at Pulliam plant News-Chronicle A small number of employees might have been exposed to radioactivity at the Pulliam Power Plant in Green Bay during replacement of equipment, Wisconsin Public Service said Thursday. The amount of exposure over the two weeks was about equal to that of a dental x-ray, the company said. The incident was discovered Thursday at a device that monitors coal transfers in the plant. A device that uses Cesium-137 sends a small bit of radiation through coal being transferred from the coal yard into the plant. The radiation goes into a device on the other side of the conveyors. The process is designed to catch backups and spillage. During maintenance on Sept. 23, the device was removed without properly closing its "shutter" and placed nearby. It was discovered at 8 a.m. Thursday and immediately removed. WPS said employees working or walking through the area might have been exposed. The company said a person standing 10 feet away from the device for six hours each day during a regular work week would get the amount of radiation in a dental x-ray. WPS officials are working with the Nuclear Regulation Commission and state health officials to make sure no one was harmed by the incident.