Sampl2 Analysis
Prior
to preparation for analysis,
refrigerated for approximately one year.
coagulated.
the four human milk samples nad Seen
During this time the samples had
Therefore, each sample bottle was placed in an ultrasonic bath
until the sample was thoroughly homogenized.
Samples were then transferred from
the orizinal polyethylene bottle iato a teflon lined aluminum sample container.
The sample bottles were rinsed with distilled water and residual sample removed.
The sample plus rinse water was diluted to 150 ml, counted for 50,000 seconds on
a 25% relative efficiency lithium drifted germanium detector and analyzed
photon emitting radionuclides which exceeded background
for
levels. The decay
corrected results and one sigma counting errors are presented in Table 2 along
with specific sample information.
13766 was the only radionuclide positively
identified in three of the four samples.
Using the above technique, no potassium was detected in any of the
samples.
However, the expected potassium concentration in human milk (ICRP75)
as shown in Table 3, is at least a factor of 10 smaller than the minimum detectable potassium concentration for the sample size and selected counting time. The
measurement of potassium at
the
.5 mg/ml concentration would require a aLlainum
counting interval of one week and even then would have a two sigma counting
error in excess of 90%.
The potassium values listed in Table 2 were obtained by atomic absorption.
An aliquot of the diluted milk sample was used in the evaluation.
This analysis
technique is more sensitive than gamma spectroscopy and has a lower detection
Limit of 0.2 ug/ml.
The ratio between the 1376, activity concentrations in their milk and the
13765 body burden of the adult lactating female is shown in the Last column of