The licensee provided the following information via e-mail
The licensee received six model 880-12-6-20 self-luminous signs from Safety Light Corporation in May of 1994. The report from Safety Light did not list serial numbers. The licensee's facility was remodeled in 2005. They have done a number of searches for the missing signs and have not been able to locate them. The licensee does not know where they are. They assume that the signs were misplaced during the remodel. This Department does not have the model numbers as they were not a part of the report from Safety Light in 1994. The licensee previously had not done a complete inventory to record the serial numbers.
Event Cause: Inattention to Detail
Corrective Action: No Corrective Action Taken
Each of the three missing Safety Light Corporation signs initially contained 11.5 cuires/425.5 GBq of Tritium
Event Date: 07/01/2005
Reporting Requirement: 20.2201(a)(1)(i) - Report of theft or loss of licensed material > 1000 x App C value
Reference Number: 04-20-07
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