SOIL PROFILE SAMPLING
SURFACE
05
TRU
FPDB
|
0-5
5-10
10-15
17,.6-22.5
|
15-25
i
P
37.5-42.5
57.5-62.5
25-40
|
a
p
-
T
|
0
E
P
H
F
a
S
oO
—
77 .5-82.5
40-60
I
a
.
a
(CM)
97.5-102.5
117.5-122.5
bee
er
FIGURE 6-23. COMPARISON OF TRU AND FISSION PRODUCT SOIL
PROFILE SAMPLING PLANS
one-sixteenth hectare, which required data on a 6.25-m grid. The latter requirement stemmed from
a policy decision that at least four values were needed to obtain an average; each value from a
6.25-m grid would represent one sixty-fourth hectare and any four adjacent points would be averaged
to
obtain the one-sixteenth heetare value.
The iterative sampling procedure that was developed
greatly reduced the number of samples which had to be collected and analyzed, and "zeroed-in" on
excision boundaries (Figure 6-24) with few iterations. (Details of the procedure appear in Appendix
B, Tech Note 18.) Use of the IMP detector system for sample scanning contributed separately to
both the reduced number of samples requiring laboratory processing and shorter lag time in obtaining
guidance for additional iterations of sampling. However, the utility of the iterative procedure is not
dependent upon a "field-operative" system like the IMP.
192