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The following information was provided by the Wisconsin Department of Health Services (the Department) via email and telephone: On October 30, 2023, at 1830 CDT, the Department received a notification from the licensee that a CPN MC1DRP gauge containing up to 10 mCi of Cesium-137 and 50 mCi of Americium-241 had been out of their control since 1435 CDT when the vehicle containing the gauge was stolen. Local law enforcement has been notified. The Department will monitor and update. Event Report Number: WI230019

• * * UPDATE FROM MEGAN SHOBER TO DAN LIVERMORE BY EMAIL ON 10/31/2023 * * *

The missing gauge was recovered around 0800 (CDT) on October 31, 2023 and is now in the custody of the licensee. The gauge had no visual damage. The Department will follow up with the licensee. Notified R3DO (Dickson), ILTAB and NMSS Events notification by email. THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf