[en] In July 1973, a field experiment was conducted at Rocky Flats to measure plutonium resuspension. Previously, for this experiment, airborne plutonium concentrations in respirable size ranges were reported. Concentrations were measured at three sites between the eastern security fence and eastern cattle fence. On 13 nonrespirable particle diameter ranges between 10 and 210 μm, ²³⁹Pu concentrations range from 10^-8 to 10^-4 μCi/g. Airborne ²³⁸Pu concentrations as a function of particle diameter ranged from 10^-9 to 10^-5 μCi/g. Both ²³⁸Pu and ²³⁹Pu were found on all particle diameter ranges. Airborne plutonium fluxes on nonrespirable particles decreased with both height and distance. The nonrespirable total ²³⁹Pu flux ranged from 1 x 10^-7 to 6 x 10^-4 μCi/m²/day. Airborne ²³⁸Pu/²³⁹Pu ratios were always equal to or greater than similar ratios reported measured on the ground surface. Ground surface ratios ranged from 1.5 x 10^-2 to 2.2 x 10^-2. Only near the eastern security fence were airborne ratios similar to ground level ratios. At the eastern security fence, airborne ²³⁸Pu/²³⁹Pu ratios ranged from 0.2 to 0.4. These airborne ratios were one order of magnitude greater than ground surface ratios. Increased ratios indicate ²³⁸Pu is more readily resuspended at greater distances from the eastern security fence than near the eastern security fence