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