ett ee + a antiRRO
occurring radionuclides to identify radionuclides
in the gamma
spectra.
radionuclides based
It
on
also generates
those
spectra
the radionuclides were present
from any observed photopeak
an upper
regions
limit
where
amount
signals
in detectable quantities.
of
would
specific
be
Listed
seen
if
in Table 1
are the detection limit values for various radionuclides based on the average
weight of tissue shown for a counting period of 1000 min.
fish bone
sample
for
example,
3766
would
not
have
For an average-size
been detected
by
spectrometry if the concentration was less than 11 pCi/kg dry weight.
at Bikini and Enewetak,
40,
detected
13766
and
in
gamma
Except
the only radionuclides other than naturally occuring
fish
and
occasionally
clam
6000.
muscle
In
tissue
muscle
by
gamma
tissue,
all
spectrometry
other
were
radionuclides
indicated in Table 1 were below the limits of detection by gamma spectrometry.
A
more
complete
description
of
the
gamma
equipment
used,
calibration,
sensitivity of detection, uncertainties, and methods for setting upper limits
is given in Ref. 9.
After
gamma
laboratory
13766,
or
analysis
retained
238,239,240,
the
at
LLNL
and
from muscle
for
dose
tissue
for
either
Except
for
spectrometry and are
assessment.
and
were
analyzed
sent
radiochemical
241an,
cannot be detected by gamma
significance
samples
The
1376,
to confirm
a
separations
13766,
judged
was
the
to
contract
of
these
to be
nuclides
of potential
radiochemically
méasurements
905,
separated
made
by
gamma
spectrometry, which in turn provided a useful interlaboratory calibration for
quality
control.
Separation
techniques
used
at
LLNL
are
published !
and
those used by the contract laboratory are summarized in Ref. 9.
A number of
duplicate,
the
samples
blank,
analyzed
quality-control
analytical
and
at
standard
LLNL
results
performance
and
for
was
samples
at
the
the
were
contract
marine
extremely
intermingled
good.
laboratory.
samples
A
with
All
demonstrated
full
discussion
regular
available
that
of
all
the
the
quality control data for the 1978 survey results is in preparation.
DOSE ASSESSMENT METHODOLOGY
An
For
a
abbreviated
more
description
detailed
of
discussion,
the
the
dose
assessment
recent
reassessment of Enewetak Atoll may be consulted. !?
report
methodology
on
the
follows.
radiological