TION
i ne ONee
SPAER AERO ne
hyn
TTF
fe® Rao . oohiplets blood count, erythrocyte
ie, ad uriralysis in accord» naval regulations. The find“nes. Of thee: saminations were to be recorded
of Sinndaed Ferm @8 and in the health records
of the man isvalved, Complete blood counts and
urinalyses were to be accomplished at weekly
inter vale and findings appropriately recorded.
Follow-up physical examinations were to be
conducted in accordance with naval regulations.
The men were not permitted for the remainder
of Operation Greenhouse to enter areas in which
any radiological hazard existed.
It is strongly suspected that a deliberate attempt was made to obtain a high exposure on
the subject film badges, probably by leaving
them on the shot island in a contaminated area
for a considerable period of time, although none
of the subject men would admit this. Certainly
no other boat crew members operating under
almost identical conditions obtained exposure
within an order of magnitude of that obtained by
the subject men.
Additional study on the fall-out problem was
done by Thomas N. White and Harry F. Schulte
(see Sec. 2.6).
Results of island surveys following Easy shot
appear in Appendix B, and results of atoll surveys are given in Table 2.2.
2.4
GEORGE SHOT
The radiological safety problem after George
shot was much simpler than after Dog and Easy
shots. The winds were ideal, being from the
west-southwest throughout their entire structure, thus eliminating the immediate downwind
fall-out hazard in the Atoll. No secondary fall-
out was detected on the Atoll from George shot.
A new procedure wasinitiated on this shot
in that recovery operations were delayed until
a radiological safety survey of the shot island
was conducted. This survey was started about
14 hr after the detonation, and at noon, 23 hr
.
after the shot, a radiological safety clearance
for proceeding with recovery operations was
issued.
Recovery operations were practically complete on 19 May 1951, and no significant or ex' cessive exposures had been reported. The
res Ce ae
te ee eee
..RyTHsding Hingerprints, 7... » Average.exposulsfor personnei of TU 3.1.5 was
+ nae OR te ORO
2 ete ee
ee
Orne ee tm ee tee ow eteerr eg
Precio 2 ttle nine aoe
about 700 mr pexshot.
Film badge dais from 3,180 individuals as of
15 May showed an average radiation dose of
422 mr. If casual visitors were eliminated from
the list, the average dose received by 2,236
persons was 600 mr: This does not include exposures from fall-out after Dog shot and the
subsequent lighter fall-out from Easy shot. The
cumulative dosage on Parry from fall-out as of
14 May 1951 was approximately 2,200 mr outof-doors. For further information concerning
fall-out, see Secs. 2.6 and 2.7.
A radiological survey made during the week
of 7 to 14 May 1951 on Ujelang, Ponape, Bikini,
Rongelap, Lae, Ujae, and Kwajalein showed no
significant contamination. Water samples that
were collected on these islands showed no significant activity.
Results of island surveys following George
shot appear in Appendix C, and results of atoll
surveys are given in Table 2.3.
2.5
ITEM SHOT
Item shot was fired at the usual predawn
time. According to the latest meteorological
reports, the winds were in a transition period,
and it was evident that the probability of fallout on Parry and Eniwetok was borderline.
It had been agreed that no recovery would be
attempted until at least 3 hr following the shot,
at which time a preliminary radiological survey
would be made. However, owing to some changes
made on the night before the test regarding air
transportation, it became necessary to attempt
an early recovery. Therefore, at H+30 min,
Maj Gerald M. McDonnel, Dr. Howard L.
Andrews, and Gen Cooney flew to Engebi by helicopter and landed near Building 69. Upon arrival, the radiation intensity was about 400
mr/hr outside Building 69. The building was
opened, and radio and telephonic communications were established with the radiological
safety building on Parry. Another radiological
survey was then made around Building 69, and
it was found that the intensity had risen to
1.2 r/hr. It was evident that a large-particle
fall-out was in progress. As a matter of fact,
the falling particles could be felt on the face
and hands. Radio communication was established
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