As at Eneu,
HFH 1, the chemical quality of the
the radionuclide con-
centrations in Bikini surface ground-
water also changed slowly over the
water samples are variable.
Both
90
239,240
the
or
Pu are in higher
nd
day.
concentration in the groundwater
any use, withdrawal rates should not
from Locations north of
exceed 8 litres/min.
baseline
in
(HFH 3,
the waters
137
The
Cs
south
of
to assure the best-quality water for
the center
HFH 4, HFH 5)
this
concentrations
Therefore, we recommend that
than
The mean
Cs
concentration
in
the surface groundwaters at Bikini
road.
was 430
show no
+
179 pCi/litre.
An addi-
apparent geographical correlation,
tional 2.4% is associated with the
and none of the radionuclide concen-—
particulate phase.
137
trations appear related to water
freshness.
lowest
Ose concentration in its
water.
The last two samples pumped
from HFH 1] had the lowest
water.
In a
shows
‘os and
recent
90
report,
Sr
Conard
concentrations
in well water samples
from several
Bikini lecations for the years 19/1,
Oc con-
centrations and the highest
on the aver-
concentration guideline for drinking
to have the
Cs concentration and the
highest
Cs concentration is,
total
age, 2.5% of the recommended FRC
Of the newly established
wells, we found HFH 4
The present
1972, and 1973.
"os
Since no locations
concentrations among the newly estab-
or identifications were given with
lished wells.
Conard's data, we have averaged
gest
1s
that
These data might sug-
;
the concentration of
inversely related
to
137
both the 13766 and
1S
for each year and have plotted the
the concen-
;
9
tration of Ose,
values,
trations increased over the day,
both
the
time in Fig.
"os groundwater concen-
the
Oo,
a
:
é
nd 239,240),
|
tofether with our 1975 mean
concentrations,
During the pumping experiment at
HEH 1,
Os, concentrations
c
5.
as a function of
Although
the stan-
dard deviations during any single
but
year are large,
concen-
the data strongly
trations were lower in the final sam-
indicate that
ples than in the first sample.
water concentrations have declined
These
over the last four years,
data demonstrate that a single radio-
90
nuclide should not be used as a universal indicator
the mean
while the
os
Sr concentrations appear to have
increased over this same
to describe the
los ground-
interval.
temporal variations of other radio-
These data demonstrate again the
nuclides in the groundwater reser-
great need for detailed assessment of
voirs.
the mechanisms controlling the
Coincident with the radio-
cycling of individual radionuclides
nuclide changes during pumping at
-16-
JUPU2ZO4