On June 3, 2016, the US Air Force determined that two (2) check sources containing Thorium-232 (45 nCi and 13 nCi) were missing at the Aviano Air Base located in Italy. These two generally licensed sources are used as check sources for the ADM-300 survey meter.
The licensee contacted NRC RIV (Michelle Simmons) who recommended that the licensee report the loss per 10 CFR 31.5(c)(10).
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