t
3.2.1—The| Cherokee [ecvice, detonated In air over Namu, produced no
contamination et Bi
oll, The pre-entry survey, flown at approximately
H+2 hr, showed the entire atoll clear and radiation levels at background.
3.2.2—The 2unt
device, fired on the ground on Eninman, produced
heavy contamination
throughout the entire atoll, with the exception of Enyu
Island. Survey results at H+4 hr are shown in Fig. 3.1. The fact that Enyu
was not contaminated was most fortunate as it allowed operations to proceed
from the camp ashore {pn a normal manner,
i
$.2.8—The [Fathead] device, fired on a barge off Yurochi, produced heavy
contamination on the northern islands of the atoll. In Fig. 3.2 are shown
survey results at H+4 hr. No delay in recovery operations or preparation
for the next sh
experienced.
5.2.4The| Dakota (device was also fired on a barge off Yurochi. H+4
hr survey results are shown in Fig. 3.3. Contamination levels were much
lo ver than expected and recovery operations were carried out as scheduled.
3.2.5—The[Navajo
evice was fired on a barge off Yurochi. As with
the [Dakota J contammation levels were quite low and did not Interfere with
recovery
opérations. Survey results are shown in Fig. 3.4.
3.2.6—The|_ TEWA
*__[device was fired on a barge anchored on the
reef west of Yurochi, Contamination was heavy on the northern islands of
the atoll, In contrast to the other barge shots, contamination was also experienced on the atoll's southwestern islands. See Fig. 3.5 for H+ hr survey
results, The heavy contamination delayed soma of the recovery operations
and also the roll-up operations, Fall-out from the firing of this device contaminated Eniwetok Atoll.
3.3
On-Site Fell-out
Very little fall-out was experienced on Enyu Island. On three occasions
fall-out was observed and the backgrcund was increased somewhat. Full-out
from the (Zuni
device started approximately 28 hr after detonation and
continued for
afproximately 12 hr. This fall-out was very ligat, with a peak
intensity of 12 mr/kr gamma radiation, Fall-out from thef Navajo—] device
occurred approximately 18 br after dctonation, with peak gamma Intensities
of 22 mr/hr. Very slight fall-out from the
TEWA
device approximately 18 hr after firing increased the background by approximately 4 mr/hr.
Heavy rains occurred during the fali-out periois following the firing of the
{Navajo
(C_TEWA
(and exceptionally high activity was observed in
the rainwater,
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