October 21, 2002

On July 22, 2002, the June finger ring thermoluminescent dosimeters worn by a Lawrence Livermore National Laboratory (LLNL) employee (referred to as the Researcher) were determined to have exceeded the annual dose limit. The annual occupational dose, per 10 CFR 835. 202, to any extremity is limited to 50 rem. The ring dosimeters (Nos. 92783 and 92758) were initially determined to have received 120 and 54 rem dose respectively. Following recalibration of the dosimeters with cesium 137 to doses approximating the actual doses, the doses were revised to 111 and 62 rem, respectively. These doses represent 2.2 and 1.2 times the annual extremity dose limit.