The State provided the following information via email:
On 6/15/06, the RSO at Earth Systems Pacific contacted the RHB-Richmond office to report a nuclear gauge incident that occurred in the evening of 6/14/06. On 6/14/06 one of their moisture density nuclear gauges (CPN, Model MC1DR, S/N M10906353 containing 10 millicuries of Cs-137 and 50 millicuries of Am-241) fell off from a back of a truck onto the highway during transportation. A member of the public picked up the Type A container (with the gauge inside) and transported it into the jobsite. The jobsite personnel immediately contacted the Fire Department. The gauge was then handed over to the Fire Department. The Fire Department inspected the gauge and contacted the licensee. On the same day, the Alternate RSO picked up the gauge from the Fire Department and brought it back to the licensed facility. According to the RSO, the gauge was inside the Type A container during the whole incident and there was no visible damage to the gauge. They have performed a leak test and sent it for analysis. The RSO is expecting a report from the Fire Department. The RHB South RM office is awaiting additional information on the incident, including additional information concerning the Fire Department involved, and will investigate the reason the gauge was apparently unsecured in the licensee's vehicle.
California Report # 061506