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The following information was received by e-mail: Chevron left a voicemail message on 7/28/10, reporting two devices missing (to the Los Angeles County - Region 7- State of California-Health and Human Services Agency otherwise known as the 'Agency'). (The Agency and the licensee) exchanged voicemail messages until (the Agency) was able to talk with the (licensee Radiation Safety Officer) RSO on 7/30/10. (The devices) are Nitons, serial numbers U2779 & U 2778. Each contains 20 mCi Fe-55 and 10 mCi Cd-109. The reporting quantities (1,000X) are 100 mCi Fe-55, and 1 mCi for Cd-109; the Cd-109 is the source that makes this immediately reportable. The sources were last leak tested on November 5, 2007. The RSO looked for them again in May 2008 at the Chevron's 'storehouse,' where these devices were kept. (The storehouse) was moving and (personnel) said they didn't know where (the sources) were (located). Subsequently, the storehouse said they had been sent back to Niton, as a trade-in for devices using X-ray instead of a radioactive source. Chevron asked Niton to send them a letter saying they had received the devices, but Niton said they had never received the devices. Chevron does have devices using X-ray. They continue to look for the devices, and will check their invoice to see if they had received any trade-in credit when they purchased the X-ray devices.

• * * UPDATE AT 1937 EDT ON 8/3/10 FROM CASS KAUFMAN TO S. SANDIN VIA EMAIL * * *

The following information was provided as an update: This is an update for the missing gauges previously reported on 7/30/10. The licensee found records of source exchange, which makes this a 30 day reporting event, and not an immediate reporting event as previously stated. The two gauges remain missing. This is a follow-up to our conversation a few minutes ago, & to clarify the reporting requirement. These missing gauges are still required to be reported, but within 30 days, rather than immediately. The sources that require reporting are cadmium 109. Now that we have information that the sources were exchanged in February 2006, the activity of Cd-109 is below 1 mCi (the current activity is about 0.85 mCi). So this is required to be reported within 30 days." Notified R4DO (Hagar) and FSME (Lewis). 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 This source is not amongst those sources or devices identified by the IAEA Code of Conduct for the Safety & Security of Radioactive Sources to be of concern from a radiological standpoint. Therefore is it being categorized as a less than Category 3 source