was mounted on the barge to obtain information relative to the effect
of slope (pitch) on the retentivity of contamination. These panels
were arranged in 10 degree increments of slope ranging from
horizontal to vertical as shown in Fig. 2.2. The barge participation
was originally contemplated for Shot Echo, and the barge was moored
in a favorable downwind location with respect to ground zero selected
for this shot.
In view of the cancellation of this shot, however,
the barge was moved to as favorable an anchorage as possible for
participation in Shot 6. Besides the data expected to be derived
from the panels themselves, additional operational decontamination
infermation was expectzd to be obtained from the clean-up of the
barge itself.
2.2
2.2eL
OCR IPTION OF TEST SURFACES AND EQUIPMENT —
Test Panels
Four identical sets of: test panels were fabricated. Each set
cousisted of ik, four foot square panels of widely used outside
construction material surfaces. Table 2.1 contains a description of
the type cf surfaces, preprotection measure, and mounting position of
each uf the panels. The relatively heavy masonry and concrete
pavement panels were fabricated in two sections to facilitate handling,
but their mounting was in pairs for proper comparison purposes.
Figures A.l through A.1k show a view of each panel. These photographs were taken subsequent to decontamination and on some surfaces
clearly show the effects of weathering and decontamination efferts.
2.2.2
Panel Mounting Racks
To expedite handling, and thereby to reduce the exposure of
recovery personnel to a minimum, each set of panels was mounted on a
lightweight tubular steel rack designed to fit a predetermined space
on board ship.
The test panels were mounted in such manner as to
retain their normal orientation under fallout exposure conditions, -
i.e., pavement panels were placed horizontally, wall panels vertically,
and roofing panels on slopes consistent with their normal use, Each
rack was equipped with a lifting ring and a quick unfastening device
to facilitate recovery under contaminated conditions,
This assembly
was handled as a single unit from shore to ship initially, and from
ship to shore following contamination,
2.2.3
Panel Weather Covers
It was anticipated that several days would elapse following
exposure to contamination before the panels could be recovered from
the ships. To preserve the original contamination patcerns on the
panels of the YAG 0 (unprotected ship) from the effects of weather
during this period, delayed action, flexible, waterproof covers were
provided, These covers, similar in operation and general appearance
to conventional window shades, were rolled up and suspended above the
panels. Metal guides were provided along the edges of each panel,
17
CONFIDENTIAL — RESTRICTED DATA