The licensee provided the following information via email:
The licensee discovered a missing self-luminous sign (Safety Light Model 2040, Serial number D76434) upon doing the annual inventory. They believe the sign was removed by the contractor during a remodeling project in the building about four months before. They believe the sign is in the landfill. They will replace all of the self-luminous exit signs with non radioactive exit signs in 2007.
Isotope - Tritium, Activity - 25 Curies.
Nebraska Event Number: NE060008
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.
This source is not amongst those sources or devices identified by the
IAEA Code of Conduct for the Safety & Security of Radioactive Sources to be of concern from a radiological standpoint. Therefore is it being categorized as a less than Category 3 source