The following information was received via E-mail:
On June 4, 2015, the licensee notified the Agency [Texas Department of State Health Services] that on June 3, 2015, it was performing routine shutter checks on fixed nuclear gauges at its facility and found the shutters on four of the gauges would not close. All four gauges were Ronan Model SA-1 containing cesium-137 sources (20, 40, 50, and 200 millicuries). The licensee lubricated the shutter mechanisms on all four gauges and let them sit overnight. Two of the gauges closed the next morning (June 4th) with no problem. The other two shutters still would not close. The licensee contacted an outside service group and it recommended using a different lubricant. The licensee followed the suggestion and both became operable that afternoon. These gauges normally operate with the shutter in the open position. There were no radiation exposures or increased risk of exposure as a result of this event. An investigation into this event is ongoing. More information will be provided as it is obtained in accordance with SA-300.
Texas Incident Number: I-9318