PNNL

Abstract

Tooth enamel EPR spectroscopy was used as a method for external dosimetry in the territories contaminated in the 1950s by PO Mayak (Urals region) to validate the mean dose estimates predicted by the Techa River Dosimetry System (TRDS). The purpose of this study is to validate the uncertainties of TRDS doses. Ninety percent confidence intervals (90%CI) of dose estimated with both methods were compared for 220 people. All data were grouped according to the width of 90%CI, viz.: (1) 90%CI of EPR-based dose = 90%CI of TRDS prediction (38 cases); (2) 90%CI of EPR-based dose > 90%CI of TRDS prediction (182 cases). 91% of 90%CIs overlap. In group 1, 100% cases overlap. In group 2, 80% of the cases were noncontradictive (the calculated 90%CI is completely within the measured one). Interval comparison of doses predicted retrospectively and estimated based on individual measurements are noncontradictory and demonstrate a good agreement.