The State provided the following information via email:
[Deleted] of the City of Santa Rosa City Hall, Facilities Maintenance reported that a single tritium exit sign that was used at the facility located at 520 3rd Street, Santa Rosa, formerly owned by AT&T, and later sold to the City of Santa Rosa, was missing. The single Isolite Tritium Exit sign (S/N A3N1685) was listed on the inventory list but was not located when they took over the facility. [Deleted], the representative of AT&T acknowledged the loss and reported it to RHB on December 12, 2007. The inspector assigned to this issue will visit the facility in the very near future to investigate and determine if any of the Santa Rosa personnel are aware of the location of missing H-3 exit sign.
CA Incident Number: 121207
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