Characterization and Fission Product Sampling
Ursula was staked on a 100 m grid because camp facilities made the staking of a 50 m grid
impossible. Soil samples were collected on this 100 m grid for the Fission Product Data Base
Program (FPDB) in support of the dose assessment (see Section 6.11). Fifteen locations were
sampled and soil from,all of the locations was analyzed for 90sr, Tables 7-1, 7-2 and 7-3 summarize
the 0-15 em data for 137s, 99Sr and 239;240py, respectively.
IMP measurements were also taken on this same 100 m grid in March 1979. Soil samples to
determine a ratio of TRU to 24!Am were not collected, but based on results of the FPDB sampling, a
ratio of 2.80 + 0.11 was calculated. All TRU values were less than 5 pCi/g based on original data.
(See Tech Note 23 for a discussion of original versus final data.)
Figure 7-43 indicates the IMP locations and Figure 7-44 shows the isopleth of the TRU activity based
on final data. Table 7-4 gives island averages for computed TRU,
final IMP data.
Cs, and 69Coactivities for the
The island average transuranics value reported in the Certification is 1.9 pCi/gm for surface soil,
and the transuranics classification is Residence.
we
:
wa
|
we
:
de
Eg
{
OCEAN
APPROXIMATE
s
HIGH TIDE LINE, (972
© = IMP LOCATION
URSULA - LOJUWA
e+
a
1OCm
FIGURE 7-43. ISOPLETHS ON FINAL ESTIMATED SURFACE TRU ACTIVITYIN pCi/g
FOR ISLAND URSULA
254