The following report was received from the State of
Nebraska via email:
[The licensee] contacted [the Nebraska Office of Radiological Health] on January 12, 2017. The licensee indicated that they purchased the theater from Perkins Delaware, LLC but were not informed of the Tritium exit signs or the related license. The licensee became aware of the signs and the related license when they received the annual renewal and related inventory. The licensee opted to dispose of the signs with SRB technologies. During the packing process, the licensee discovered two signs missing from the inventory and is unable to ascertain when they were lost.
Lost Source Number: 1, Source/Radioactive Material: SEALED SOURCE LUMINOUS, Manufacturer: Isolite, Model Number: 2040, Serial Number: A4N1925, Radionuclide: H-3, 7.5 Ci 277.5 GBq.
Lost Source Number: 2, Source/Radioactive Material: SEALED SOURCE LUMINOUS, Manufacturer: NRD, INC., Model Number: T4001, Serial Number: 61821, H-3, 25 Ci 925 GBq.
Cause: Human Error. Corrective Action: None. The State of Nebraska considers this event to be closed.
Nebraska Item Number: NE170001.
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