This is a summary of information received from the state of
Nebraska via a phone call:
On December 2, 2019, the state of Nebraska identified a lost tritium exit sign that was improperly transferred by the licensee to the state of Wisconsin. The general licensee indicated that they transferred the exit sign to a electronics company in Wisconsin, which was not licensed to possess radioactive materials. It is believed that the sign was reused by the electric company. The company was contacted and is working with the Wisconsin Department of Health on ascertaining the exit sign's location.
The tritium exit sign is a Isolite model 2000 (S/N: H114041) with an activity of 12.57 Ci.
No further investigation is planned at this time and Nebraska has closed the event.
Nebraska incident number: NE190006
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