The external audit was used to evaluate analytical bias (on synthetic and field samples) and precision (by comparison of duplicate-duplicate results). A quality assurance programme was established for field sampling, sample handling and transport, and laboratory procedures and reporting. Remeasurement of thorium- 230 in the pore water of Lacnor tailingsĪ resampling of the Lacnor tailings management area was undertaken under a comprehensive quality assurance programme to establish levels of thorium 230 in pore water. Finally, new methodologies for detecting alpha-emitting radionuclides in the field are described This paper provides discussion of the manner in which the properties became radioactively contaminated, followed by a discussion of the difficulties associated with the detection of thorium- 230. Thorium- 230 analysis is costly and time-consuming, and as a result, soil sample analysis results are not available to help direct the field sampling program. Since field instrumentation is not available to detect the presence of alpha-emitting contamination in soil, soil samples are being collected and sent to an analytical laboratory for analysis. The primary radioactive contaminant on these properties is thorium- 230. Louis Downtown Site, Coldwater Creek, and the associated roads and vicinity properties. Louis Airport Site, Latty Avenue Properties, St. Department of Energy's Formerly Utilized Sites Remedial Action Program. The authors are currently performing radiological surveys on approximately ninety properties in the St.
International Nuclear Information System (INIS)
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