22
As is to be expected from the nature of the cleanup and emplacement, there is a wide range of concentrations. Summing the team
with the 73°*?**py, one arrives at a mean value for the transur-
anics of 21.4 pCi/g. If there are 12.6 Ci of transuranics in the dome
(U.S. Department of Energy 1979) contained in 105,000 cubic yards of
soil and one assumes a density of 1.8 g/cc for the soil, the average
concentration to be expected would be:
12.6 ° 10%?
105,000 * 0.76 *° 10° ° 1.8
=
87 pCi/g.
The observed and calculated values are in reasonable agreement since
the contribution from the material encased in concrete in the "donut
hole” at the center of the dome is nat considered and neither the means
Calculated from the samples nor the estimates made during the cleanup
are likely to-be very accurate.
Water samples taken from two different levels of a hole drilled in
the dome also were analyzed.
The water was filtered through a 0.45=-
micron filter and both filtrate and filter were analyzed.
The mean
values (in pCi/!) were as follows:
Radionuclide
Soluble
2asTasep,
|
telan
Particulate
0.05
77.8
0.005
67
**Sr
331
“*76s
248
112
.
146
The transuranics are essentially all associated with the particulate
fraction and not as available for transport as ''’cs and '*Sr where
the greater concentrations are in the soluble fraction.
The mean
values (in pci/t) for samples from the 20-foot level in the two wells
outside the dome were as follows:
Radionuclide
iseTreepy
Sdn
reg,
137%
s
Soluble
:
|
.
.
Particulate
0.142
164
0.003
59
225
156
27
.97
Somewhat higher concentrations of all nuclides were found in samples
from the 40-foot level in one well.
However, at the present time it
is not clear if these radionuclides in the well samples are coming from
the dome or from the fall-back zone or were present in the soil from
other causes such as the work done in preparation for construction of
the dome. An artificial beach was constructed for the off leading of
the material placed in the dome and it is probable that contaminated
toe
on
A
Mow?
cma
cr)
cn
soil was used in its construction.