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“TASK UNIT 7 - J, D, Servis, Maj, USA
‘BADIOLOGICAL SAFETY
%. Rad-Safe Survey Summary
, 3An
(J. D. Servis)
A partial Rad-Safe survey was conducted on
day with incomplete atoll results.
Results of this survey
(Table TU-7-2), indicated no extensive recontamination of
the atoll except within the Boxobyaadaa - Nama chein.
An
unforeseen fallout of radioactive material less than 5
microns in size did occur on the night of R+1.
This fall-
out covered the atoll and raised radiation levels by approximately 100 mr/hr.
Because of the late period of fall-
out this radiation level would have corresponded to 3.5 r/hr
fallout at H+2 hours,
This fallout, because of small
particle size, was much more difficult to decontaminate than
the (eres —
Secondary fall out levelled off between 0700-0800,
R+2.
Residual top-side levels on ships were:
Ainsworth -
itinnhen Aightbie
8 mr/hr, Estes - 12 mr/hr, and Bairoko - 30 mr/hr.
Maximum
Ievels were 20 mr/hr to 45 mr/hr.
.
Lagoon contamination covered the western quarter
of the lagoon with levels eS Lagoon
See
flushing through the southwest passage materially increased
background radiation levels in the vicinity of Ourukaen,
Bokoaetokutoku, and Bokororyuru,.
COPIED/DOE
LANL RC