TABLE IT PLUTONIUM CONCENTRATION AND VARIABILITY ESTIMATES IN SOME STUDY AREA SOILS : Location n O to 2.5 cm mean (pCi/g) cv n (depth, cm) To Depth mean cv (pCi/g) Alamos. Mortandad Canyon 5 140 0.52 15 (30) 30 0.79 DP-Los Alamos Canyon 6 0.42 0.63 21 (30) 0.73 1.6 21 1.7 Acid-Pueblo Canyon 7 10 0.48 21 (30) 0.44 0.82 8 (25) 0.07 0.68 0.48 8 (33) 0.14 0,68 Site 8 Ground Zero 8 Area 21 2 Eniwetok Atoll Janet Glenn 12 18 1.9 138 (15) 16 1.3 3 0.15 0.21 29 (15) 0.11 0.62 4 880 1.2 39 (5) 36 1.4 3.1 Nevada Test Site Area 13 Strata 1 3 460 000 0.67 47 (5) 14 000 Strata 1 5 2 200 1.5 41 (5) 59 1.4 Strata 4 2 150 000 0.8 23 (5) 7 300 1.1 6 (5) 0.16 1.5 Strata 6 Area 5 Thule, Greenland Rocky Flats Macroplot 2 12 1167 3..2 TABLE [It ‘concentration in < 45-um size fraction to depth of 3 cm. that the range in CVs (0.62 to 3.1) was relatively small compared to the range in plutonium concentra- tiens (0.11 to 14 000 pCi/g). PLUTONIUM CONCENTRATION COEFFICIENT OF VARIATION IN SURFACE SOILS Location Plutonium Glenn Fallout 0.21 between the magnitude of the CV and the correspond- Trinity, Aeea 21 Fallout 0.48 ing plutonium concentration within the ranges of Mortandad Liquid effluent 0.52 the data. There were no significance linear relationships DP-Los Alamos Liquid effluent 0.63 ciated with Fallout (Trinicy Site) and liquid efflu- NTS-A-13, Strata 6 Safety shot 0.67 ent Generally lower variability was asso- NTS~-A-5, Strata 4 Safecy shot 0.80 while higher CVs were associated with safety shot Trinity, GZ Ground zero 0.82 (NTS) and Ground Zero areas Acid-Pueblo Liquid effluent 0.87 NTS-A-13, Strata lL Safecy shot l. 2 (Los Alamos) sources of plutonium (Table [ITI), (Trinity, Janec). This pattern seems reasonable based on suspected physical forms of the plutonium in che respective study areas. NTS-A-5, Strata lL Safety shot 1. 5 However, ather site-related factors such as study Thule, Greenland Aircraft accidenc l. 5 area climate (and its effects on plutonium weather- Janet Multiple ground zeros 1. 9 ing), topography, and sampling methodology contribute Rocky Flats Industrial accident 3. 2 to the total variability and confound any attempts to £% Macroplot 2