Comparison of risk for pre- and post-remediation of uranium mill tailings from vicinity properties in Monticello,...

Pre- and post-remedial action dose rates were calculated on 101 Monticello, Utah, properties included in the Monticello Vicinity Property Remedial Action Project. Dose rates were calculated using the RESRAD computer code, which indicated that 98% of the effective dose equivalent was contributed by external gamma radiation and radon emanation. Radium concentrations in pCi g(-1) were averaged for pre- and post-remedial action measurements; point sources were not included in the averages. The volume of the deposit was also used in the dose calculation. In all cases the dose was reduced, and at 77 properties the dose was reduced to 0.30 mSv y(-1) (Department of Energy ALARA recommendation). A paired t-test showed a significant reduction (p<0.05) between the pre- and post-remedial action dose rates, The average cost remedial action, number of persons per household, number of properties remediated, and the reduction of cancer mortalities through remediation resulted in an approximate cost of 11,000,000 per life saved by remediation of mill tailings.