The following information was provided by the licensee via phone and email:
Two tritium exit signs cannot be located at Bridger Coal Mine in Point of Rocks, Wyoming. The signs are believed to have been returned to the manufacturer following use, but there is no paperwork to confirm. Efforts to ascertain knowledge of the purchase or return of the devices from the manufacturer were fruitless. Bridger Coal Mine does not have intentions now, or in the future, to possess generally licensed devices.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
Each exit sign contained 7.5 curies of tritium.
- * * UPDATE ON 08/11/2025 AT 1606 EDT FROM VICTOR LOUDERBACK TO ROBERT THOMPSON * * *
The following is a summary of information provided by the licensee via email:
One of the missing signs was located by the licensee. Disposal is being coordinated by a vendor.
Notified R4DO (Agrawal), NMSS Events Notification (email), ILTAB (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