For future planning purposes, Gilbert and Eberhardt included the following items in their summary:
1.
2.
3.
Pu and Am concentrations on over 500 new soil and vegetation samples
from safety-shot sites are essentially ready for statistical analysis
to update estimates of Pu spatial pattern and inventory.
These
data are in the NAEG data bank and also on computer cards at BattelleNorthwest.
320 soil samples have been collected at the grid intersections in
Figure 5 at NS=201, but have not been shipped to analytical laboratories for radionuclide analyses.
If these data are obtained, they
would be useful for estimating spatial pattern and inventory of
radionuclides at NS-201.
Plans are ready for Phase 1 sampling to begin at several nuclear
sites, including NS-200 discussed in this paper and NS‘'s-202 and
203 as discussed by Essington (1978).
4.
Design plans for additional studies at Clean Slate 2 in anticipation
of a possible cleanup effort at that site have been submitted to
the NAEG,
Samples of the type specified in recent EPA guidelines
should be collected for evaluation of their applicability to NTS
and TTR sites.
5.
Statistical analyses for the estimation of Pu inventory in blowsand mounds at Area 13 and Clean Slate 3 are completed (Gilbert and
Essington, 1977).
Particle size and spatial distribution aspects
of Pu and Am are suggested as future blow-sand mound studies.
6.
FIDLER and other mobile field detectors should continue to be
evaluated for their applicability to field studies.
Special studies
aimed at calibrating more closely these instrument readings to Pu
concentrations in field samples are encouraged.
Gilbert and Eberhardt's analyses have been invaluable to the synthesis
of environmental NAEG data.
A study of variability of data with aliquot size was accomplished and
reported by Doctor and Gilbert of PNL.
These results indicate a linear
relationship between aliquot variability (standard deviation) and aliquot
size (both in logarithmic scale) over the range of aliquot sizes studied
(standard deviation decreasing with aliquot size).
In other words,
substantial reduction in variability occurs between aliquots from the
same sample if 50-gram rather than 1- or 10-gram aliquots are used for
analysis.
The effect of variations in source term and parameter values on estimates
of radiation dose to man are examined by Bloom and Martin, Battelle's
Columbus Laboratories.
The variations in source terms and parameters
are many, due to uncertainties in sampling, measuring, and interpretation
744