reeentry for YANKEE, personnel were re-grouped, following which, all ships
put to sea (some te EXIWETOK, others scheduled for BIKINI roll-up, to remia
overnight at sea due to water readings at the NAN Anchorage of appeacimately
20 mr/he). Relative te the apparent laek of up-welling of radioactive
material, some work was done early in the operation by Dr. J. Isaacs of Project
1.6 (Water Wave Studies) whieh disclosed a deep stratum of radjoactive water
which sgoved aocrthwest toward GEORGE’ and HOW,
just prier to KOON,
This layer was quite concentrated
Vertical sections were run at several stations using 4
dunked survey mater, The distribution was as expested with the astonishing
addition of a stratum of clean water at about 110 feet overlying the radicactive water at 130 feet.
Since no major storm wasexperienced during the
operation, there remains for conjecture the effegtof4 violent disturbance
of the lagoon.
Whether or not this low-lying layer of radioactivity would
be brought up and distributed mére or less uniformly iadepth by sueh a dise
turbance is net mown.
7.
Split Atoll Operations:
‘The onesingle feature of the CASTLE Opere-
tion which nade Radsafe somewhat difficult was the fact that coverage was
required at ‘bothBIKING|and ENTHETOR Atolls. These two sites are separated
by 180 miles; persone)_krensportation, betugsn, thety,sites way prinarily oy
Cmu7? -airoraft.
_ swe wed
Astheoperetion progressed@ point wisreached at which 4
capability of firing & shot et erch atoll was simultaneously maintained to take
advantage of faverable winds occurring at one
site and not the other,
The
principle adverse effect of this situation was the requirement to split the
basic 1 7.1 Radsale Unit personnel and equipment in order to be ready to
Operate regardless of which atoll became favorsble for a shot.
During the
planning stage this unit was designed to sove from one atoll to the otner %<
50