$.2.1~The Shkee {tevice: detonated In air over Namu, produced no
contamination at
The pre-entry survey, flown at approximately
H+2 hr, showed the entiretoll clear and radiation levels at backgrounl.
3.2.2~The/ Zuni
_{device, flred on the ground on Eninman, produced
heavy contamination
oughout the entire atoll, with the exception of Enyu
Island.
Survey results at H+4 hr are shown tn Fig. 3.1,
The fact that Enyu
was not contaminated was most fortunate as it allowed operations to proceed
from the camp ashore tn a normal manner.
3.2.3~ The (Rrathead] device, fired on a barge.‘off Yurochi, produced heavy
contamination on
the northern {felanda of the atoll.
survey results at ue br.
In Fig. 3.2 are shown
No delay in recovery operations or preparation
for the next sh
rienced.
3.2.4—The Dakota device was algo fired on a barge off Yurochi. H+t4
hr survey results are shown in Fig. 3.3. Contamination levela were much
lo ser than expected and recovery operations were carried out as scheduled.
8.2.5<the [Navajolevies was fired on a barge off Yurochi.
As with
the Dakota ,fcontamfnation levels were quite low and did not Interfere with
recovery
opérativuns.
Survey results are shown In Fig. 3.4.
3.2.6-The| TEWA
reef west of Yurochl.
[device was fired on a barge anchored on the
Contamination wus heavy on the northern falands of
the atoll. In contrast to the other barge shots, contamination was also experienced on the atoli's southwestern islands. See Fig. 3.5 for H+4 hr survey
results, The heavy contamination delayed suma 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 Fall-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
continued for
afproximately 12 hr,
This fall-out was very lHgat, with a neak
intensity of 12 mr/tr gammaradiation,
Fall-out from thef_ Navajo "] device
occurred approximately 18 hr after detonation, with peak gamma intensitles
of 22 mr/br. -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 perlois following the firing of the
(Navajo
{_TEWA
[and exceptionally high activity waa observed in
the ralnwater,
- 31 -
wh
from the [Zuni__lievice started approximately 28 hr after detonation and