Sune 30, 1978
Page
2
In addition to these whole body measurements, thin crystal
dual NaI-Csi(Tl) detectors were used to determine the possible
presence of actinide nuclides. in the skull (head) and lungs
(thorax).
By subtraction of a control subject, it was possible
to remove the contribution. from the 1.46 MeV gamma from K-40.
A suitable Cs-137 phantom was then subtracted to account for
the contribution of the 0.66 MeV gamma of barium-137 m and the
32 keV X ray characteristic of barium.
The resulting count
rate in the Am-241 60 keV energy region was,
Figures
6 and 7,
as seen in
essentially non-significant and not different
from the control subject.
It is concluded, therefore, that
there is no detectable Am-241 in either subject at this time
of measurement.
Similarly,
there was no Pu-239 X-ray peak
observable in the net spectra ohtained by the procedure
described:
It has been calculated that with 1.72 wCi of Cs-137
present, our lower limit of detection for Am-241 in the skull
1S approximately 200 pCi.
For your information,
Laplander (reindeer
with you recently.
people are recorded
those of the Bikini
letter
I have enclosed a copy of the
herder) population article that I discussed
I think it is important that many of these
as having Cs-137 body burdens similar to
residents, and I have just sent off a
to our associates at Dr.
Miettinen's
laboratory to see
if there is any epidemiological health evidence available for
this group.
I look forward to our continued collaboration in this area.
If you have any questions as to the meaning of any result, |
please don't hesitate to call.
Very truly yours,
¥
) we,
Norman Cohen, Ph.D.
Assistant Professor of
Environmental Medicine
NC/j
Encilesures
cc:
Dr. M.
Dr.
Eisenbud
M.E.
Wrenn
Dr. H. Spitz
Dr.
S.
Cohn
Dr.
N.
Greenhouse
in .
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Brookhaven National Laboratory
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Dr. Robert Conard