Measurement of Radon, Thoron, Isotopic Uranium and Thorium to Determine Occupational and Environmental Exposure and Risk at Fernald Feed Material Production Center Publication Date: September 25, 2001

Research Objectives: (1) To develop an accurate personal radon/thoron monitor to quantitate exposure to low airborne concentrations before and during removal and relocation of radium from the silos. (2) To develop a personal aerosol particle size sampler, based on the principles of the novel sampler we have developed. The sampler measures not only 222Rn decay product aerosol size but long lived nuclides. There are, as yet, no particle size distribution data on the aerosol particle size distribution of these nuclides during remediation at any DOE site, although the aerosol particle size is the major determinant of lung dose. (3) To develop the sequential radiochemistry necessary to measure any environmental sample for 228,230,232Th, 226,228Ra, 234,235,238U and 210Pb. To utilize the radiochemistry and accurately trace and delineate these nuclides in the environment. To obtain historic and present radiochemical data to determine the need for supplemental soil/water etc., measurements