Overall, the average TEDE increased from 20, from 0.067 rem and 0.083 rem respectively, to 0.135 rem for 2020." However, since very little time is spent in the PWT area by workers, the dose increase as a result of the increased radon daughters in the area is likely an overestimate, and actual doses are probably more comparable to previous years.
It is recommended that radon daughter level trends be continually reviewed over the next year to confirm that the levels have returned to the expected range and to provide additional remedial actions if it has not. Review of the radon daughter levels in Pond Water Treatment and the Plant average indicate that this may not have provided the reduction anticipated. This was attributed to tanks in the PWT area, which has had water added to reduce radon and radon daughter levels in September - October 2020. " In 2020, all job groups have an increased TEDE in comparison to 20 as a result of an increase in radon daughters. The total effective dose equivalent (TEDE) is calculated quarterly based on the deep dose equivalent measured by the worker's badge and the total CEDE for the three months of the quarter." "The committed effective dose equivalent (CEDE) for each monitored worker is calculated monthly based on average uranium concentration in airborne particulate material and the radon daughter concentration in each area in which the individual worked and the time spent in the area. Worker radiation doses doubled within two years at mothballed Crow Butte in situ leach uranium mine
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