What's Happening?
The U.S. Nuclear Regulatory Commission (NRC) has released an event notification report detailing several incidents involving radioactive materials. In New York, an iodine-125 localization seed, with an activity of 48 microcuries, was reported lost from
a medical facility. It was removed from storage for implantation but was later discovered missing during a quarterly inventory. The facility believes the seed, pre-loaded into a needle, was inadvertently discarded in a sharps container while still within its lead shielding. Corrective actions include requiring two individuals to concurrently update and account for I-125 seeds. In Texas, two Troxler moisture density gauges, containing cesium-137 and americium-241/beryllium sources, were lost in transport by a common carrier. One gauge, a model 3440P, was later located in Lubbock, TX, while the second, a model 4640, remains missing. Additionally, the U.S. Army reported a potential lost or stolen source after a closed eBay listing in Hartselle, Alabama, showed an M67 mortar sight unit and M58/M59 aiming post lights, which originally contained tritium sources. The origin and current status of the tritium sources are unknown, and an investigation is underway.
Why It's Important?
These incidents highlight critical vulnerabilities in the control and tracking of radioactive materials across various sectors in the United States, from medical facilities to transportation and military surplus. The loss of an iodine-125 seed, though a 'Less than Cat 3' level of radioactive material, underscores the potential for accidental disposal and the need for stringent inventory and handling protocols in healthcare settings. The missing moisture density gauges, which contain more significant radioactive sources, pose a greater public safety concern if they fall into unauthorized hands or are damaged, potentially leading to exposure. The U.S. Army's report of military equipment containing tritium sources appearing on eBay raises serious questions about the security of sensitive materials and the chain of custody for surplus military items. These events collectively emphasize the ongoing challenge of preventing the misplacement, theft, or improper disposal of radioactive sources, which could have environmental, health, or security implications, even if the immediate risk is deemed low.
What's Next?
For the lost iodine-125 seed, the New York State Department of Health has accepted the medical facility's corrective actions, which include enhanced dual-person accountability for I-125 seeds. The incident has been closed, but the licensee is required to report any new information. The Texas Department of State Health Services is continuing its search for the second missing Troxler moisture density gauge, with the common carrier actively involved in the search. The U.S. Army's radiation safety officer plans to report the eBay listing to his chain of command and the Army legal department to investigate the provenance of the items and whether the tritium sources were legally obtained and removed before sale. These investigations will determine if the sources are still present and if any regulations were violated. The NRC will likely continue to monitor these situations and may issue further guidance or enforcement actions based on the findings, aiming to prevent similar occurrences in the future.
Beyond the Headlines
The recurring nature of such incidents, even with 'Less than Cat 3' radioactive materials, points to systemic challenges in managing radioactive sources. The medical incident highlights the human factor in handling sensitive materials, where established protocols can be inadvertently bypassed, leading to losses. The transportation incidents with the gauges underscore the vulnerabilities in logistics and supply chains, where radioactive materials can be misplaced or stolen during transit. The eBay listing of military equipment containing tritium sources raises broader concerns about the disposal and resale of military surplus, and the potential for sensitive components to enter unauthorized channels. These events collectively suggest a need for continuous improvement in training, oversight, and technological solutions for tracking and securing radioactive materials. The long-term implications include the potential for public distrust in the safety of radioactive material handling, increased regulatory scrutiny, and the ongoing risk of these materials being misused or causing environmental contamination if not properly recovered.
