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Atomic Energy Commission
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CONFIRMED To BE
DOE/OFFIC
UNCLASSIFIED ~
mmmanetL. KOLBAYaDOSS FICATION
eS
DATE:ling,
1903 Constitution Avenue
Washington, D. ¢,
Dear Mr, Wilson:
The initial report on Project Gabriel by Dr. Nicholas M, Smith, Jr.,
dated May 21, 1949, the revised cony dated November 12, 1949 and a Top
Becret letter from Drs. Latimer and Hamilton dated October 4, 1949, are
BEST COPY AVAILABLE
transmitted herewith.
These reports have been checked by Drs. Teller and
associates at Los Alamos, D& Latimer and Dr. Hamilton, Dr, K. 2. Morgan
and Dr. G. Failla.
Mr, Deal of our office has acted effectively as liaison officer |
and has aided in the calculations.
These reports as evaluated by the
individuals mentioned and myself may be summarized as follows:
material.
(A)
Limitation on numhets of bombs,
1. Plutonium and strontium”
ments of importance.
0
By effects of ingested
plus yttium””
90
are the ele-
2. The particle size resulting from an explosion ranges
from a few nicra in diameter downward with a higher proportion of the
very fine particles as the cloud gets farther away from the point of
burst.
5.
3%. The debris from a single air burst is expected to
settle out almos|/entirely in a path of 700 to 800 miles. Assuming that
the cloud is 500 miles wide, the average density of material deposited
per square mile normalized to 1 gram of original bomb debris is 3 x 107
grans per square mile.
4,
.
Owing to the prevalent atratospheric winds, bombs
detonated on the West Coast would largely thus effect only the arid moun-
tain regions: bombs detonated in the Middle West would also involve the
East Coast; and Bast Coast bombs would essentially be ineffective as
regards fall-out due to deposition of the bulk of material in the ocean.
5.
If one assumes a local fall-out area to measure
DO’ ARCHIVES
I