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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 55469 | 16 August 2021 04:00:00 | Agreement State | Missing Radioactive Source | The following information was received from the Commonwealth of Massachusetts via email: On September 16, 2021, at 1020 (EDT), the licensee notified the Massachusetts Radiation Control Program (RCP) via telephone of a missing 5 millicurie Cs-137 sealed source. The source has been missing since the last inventory performed by the licensee on August 16, 2021. Upon discovery, the licensee subsequently searched for the source with survey meters on their licensed premises and could not locate it. Personnel involved with the use of the source were immediately interviewed and later all employees were interviewed. To the date of this report the licensee has not found the source. The only item related to the source that was discovered was the top cover to the lead shielding container. The shielding cylinder and the sealed Cs-137 source are still missing. The licensee written report and RCP on-site inspection are pending. The Agency considers this matter still OPEN. 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 |