The following report was received from the
Wisconsin Radiation Protection Section via e-mail:
On October 1, 2013 the licensee identified a tritium exit sign as missing and reported it to the state of Wisconsin on October 2, 2013. Last inventoried during 2009, the sign was not recorded on an inventory conducted on September 17, 2013. The missing sign is a double-sided Isolite exit sign model 2040-07R-20BA SN: 227163. According to the SSD sheet, this device contains up to 25 Curies of tritium. The licensee stated it might have gone missing after a lighting retrofit project in 2010.
Wisconsin Report ID: WI130020
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