Dr. Robert Conard
June 30, 1978
Brookhaven National Laboratory
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In addition to these whole body measurements, thin crystal
dual NaI-CsI(T1l) 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
there was no Pu-239 X-ray peak
described.
Tt has been calculated that with 1.72 uCi of Cs-137
present, our lower limit of detection for Am-241 in the skull
1S approximately 200 pCi.
For your information,
Laplander
(reindeer herder)
with you recently.
I have enclosed a copy of the
population article that I discussed
I think it is important that many of these
people are recorded as having Cs-137 body burdens Similar to
those of the Bikini residents, ‘and I have just sent off a
letter 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,
Norman Cohen,
Ph.D.
Assistant Professor
of
Environmental Medicine
NC/3j
Enclosures
cc:
Dr.
M.
Dr.
M.E.
Eisenbud
Dr.
S.
Cohn
Dr.
N.
Greenhouse
Wrenn
Dr. H. Spitz
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Dr.
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Similarly,
observable in the net spectra obtained by the procedure
SY weg
of measurement.
_
It is concluded, therefore, that
there is no detectable Am-241 in either subject at this time
saisccuted “he SE, aedohere satin awa
from the control subject.
eae ot nope Ae pethnearepelionbbesth oe hee
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, as seen in
Figures 6-.and 7, essentially non-significant and not different
ee
to remove the contribution from the 1.46 MeV gamma from K-40.