Two Trijicon gun scopes, source ID# 6-53953 and 110-59164, both non-exempt sources, were identified as being missing from a Security rifle scopes inventory. Each scope had a [tritium] activity quantity of 57.766 milliCuries (mCi) and 60.528 milliCuries (mCi), respectively. The radioactive material is an integral part of the scope from manufacture. Scope source ID# 110-59164 was recovered, and scope source ID# 6-53953 remains unrecoverable.
The activity quantity for the these gun scope exceeds the 10 times the 10 CFR 20, Appendix C quantity, but is [less than] 1,000 times the regulatory criteria of Appendix C and therefore is being reported in accordance with 10 CFR 20.2201(a)(ii).
The licensee informed the State of Connecticut, and the NRC Resident Inspector.
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