2
240,
2?
240, 415
the chemical yields for iron
atom concentrations of
originally present in the samples.
in each sample, 242 mass tracer
39,
was added during the chemical dissolu-
Standard chemical procedures were
used for the isolation and purifica-
tion.
Specific activities were
tion of O34, Jolen, and 24]a,
calculated from the measured atom
Gravimetric measurement of the
concentrations and appropriate decay
recovered nickel and samarium -
constants.
carriers provided yields for the 6 Ni
:
1
and
Sm samples.
The addition of
determined mass spectrometrically,
283 am tracer was required to determine
traced plutonium samples was required.
the yield of the 24d samples.
Alpha pulse-height analysis was also
Nickel was purified by numerous pre-
essential for the quantification of
cipitations as nickel dimethylglyoxime.
241an.
The rare earth, samarium, was separated
americium samples were determined
from americium on a Dowex 50 cation-
from the
exchange column by gradient elution
of 238 oy and 2A was accomplished
with a-hydroxyisobutyric acid.
by the ratio of the characteristic
Since
385, could not be
alpha pulse height analyses of
42ou
Chemical yields for the
3am tracer.
Quantification
alpha peak areas to those of the
appropriate tracers.
MEASUREMENT TECHNIQUES
Thin NaI(f1) and planar Ge(Li)
Strontium-90 was determined by beta
diode pulse-height~analysis detection
measurement of the chemically separated
systems were used to measure the
64-h 20, daughter.
characteristic 6-keV Mn x ray of ° Fe.
Interferences
from radiochemical contaminants were
All samples were measured by Nal(T1).
identified and eliminated through
Ge(Li) detection systems served to
least-squares analysis of the data.
confirm results and extend the sen-
These procedures are rather common
sitivity for
for determination of the long-lived
90
Sr parent.
lower levels.
Plutonium—239,
ire detection to
Sixteen samples were
analyzed for their
240, and 241 were
Fe content.
Nickel-63 and samarium-15l were
separately quantified via mass
determined by liquid scintillation
Spectrometric measurement techniques.
counting at LLL with a Packard
Observation of the characteristic
Tri-Carb spectrometer.
mass-to-charge ratio for each isotope
Errors reported with each result
provided the means of separation
represent the measurement uncertainty
and measurement.
and are based primarily on counting
To determine the
=~ 1?~
«agg?
3010054
2 EASENT TNT | te THORS Ande,
2 ETT