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operation, the total fission yield for each operation, and the
types of shots on each operation,
a, An original danger area, a rectangle of about
150 by 335 nautical miles about the Atolis of Eniwetok
and Bikini, was in effect on Operation CASTLE until
after the accident involving the FUKURYU MARU, After
that accident, the danger area was temporarily extended
to include. a northern sector of 450 nautical mile
radius,
The latter danger area, or a2 new one based on
appropriate recommendations, will be used in Operation
REDWING from the outset,
b, The total yield produced by the six shots on
Operation CASTLE was approximately 48 megatons,
‘The
total yield for Operation REDWING based on fourteen
shots now tentatively planned should not exceed
approximately 18 megatons,.
ec, However, the foregoing does not indicate the
true relationship between the radioactive fall-out
problems on the two operations,
_
Of greater importance
to the problem of world-wide contamination is the
matter of fissionyield, —
1
yah ee
Xr,lenaapEekere,Page
da,
Furthermore, on Operation CASTLE all six shots
were surface bursts, resulting in the upward movement of
*
jarge quantities of radioactive debris from the test site, —
De®
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~ 7 -
Appendix "a"