CHAPTER 3
OPERATIONS
3.1
CONTAMINATION
Panels were placed on the YAG 39 and the YAG lO for Shot 1 and
Shot 2, and on the YAG 40 only for Shot h. Panels were not placed on
the YAG 39 for Shot h since the effect of a contaminating situation
involving an immovable structure was desired.
Therefore, arrangements
were made for the placement of these panels on an anchored barge for
participation in Shot Echo as herein before described.
When Shot Echo
was canceled, this participation was changed to Shot 6.
Details of the YAG maneuvers and the intensity levels encountered
on board ship during Shots 1, 2, and 4 are recorded in the report of
Project 6.4. Following Shot 2 the YAG 39 and the YAG hO received
different amounts of contamination.
It has been estimated by Project
6.4 that the YAG 39 received approximately 10 per cent as much fallout
as the YAG 0 (12% based on gamma surveys, 9.2% based on beta surveys).
The average radiation level on the barge for Shot 6 was 15 mr/hr at
H +10 hr.
The initial contamination level of the panels for Shots
2, 4, and 6 are summarized in Table 4.1.
3.2
RECOVERY
Following the above referenced maneuvers in the fallout areas,
the ships were recovered by Navy craft and towed to anchorage in the
Eniwetok Lagoon off Parry Island. This was accomplished in each case
within a few days after detonation,
Shot 1 = Panel contamination was so low as not to warrant
unloading from the ships.
;
Shot 2 = All panels were removed from the ships and monitored.
The extremely light contamination found. on the YAG 39 panels did not
justify their further investigation. However, a complete series of
. decontamination operations was performed on the panels from the YAG 0,
Shot
+ The panels, which had been placed on the YAG 0 only,
were removed to the deccntamination site, monitored, and decontamination operations performed.
Shot-6 = The panels on the barge were unloaded, monitored, and
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CONFIDENTIAL— RESTRICTED DATA