Publications Details
Sampling Plan for Measuring Dark Current in Model 8825 Whole Body Dosimeters Used at Sandia National Laboratories
Dark current is the measured response of dosimeters when they have been exposed to no radiation. A sampling plan was developed for measuring the average dark current associated with processing the Thermo Model 8825 whole body dosimeters currently used at Sandia National Laboratories. The dosimeters each consist of an array of 4 thermoluminescent dosimeter (TLD) chips. The population of dosimeters was found to consist of 2 strata: older and newer dosimeters. Results from some recently processed dosimeters were used to estimate the variability in response of the TLD chips of the newer and older dosimeters in the active population. The older dosimeters have more variability than the newer dosimeters across all the 4 TLD chips. TLD chip 3, which measures shallow dose, has the most variability of all the TLD chips. The sampling plan developed is based on stratified random sampling.