a=
On T+2 skiff recovery was continued at dose rates up to 1200 mrep/hr
including 80 mrf/hr.
retes of 1.2 r/nr.
YFNB-29 semples were recovered on T+2 at maximum dose
Maximum semple reading was 1.5 rfnr at 2",
A sample of
coral dust reading 50 r/hr at 4" was also recovered from the YFNB~29,
On T+3, the final YFNB-13 samples were recovered at a maximum dose rate
of 30 mrfhr,
Also on T+3 the cone samples were recovered from Aomoen and
Nama at dose rates of 1.4 r/hr on Aomoen and 9 rfhr on Nemu,
The samples read
80 mrf/hr and 150 mr/nr at 3" respectively.
On T+4, the final rollup of the YFNB~29 wes accomplished at a maximum
dose rate of 150 mr/hr.
WASHDOVN EFFECTIVENESS
Both YAG-39 and YAG-40 encountered fellout after this shot.
Fadiation
intensities aboard both ships were sufficiently high for washdown evaluation
to be msde.
form.
However, only the YAG-40 records have been reduced to useable
Early examination reveals that the YAG-39 data will give a setisfectory
evaluation when availeble,.
The YAG-40 operated in approximately a two by six mile squere area 40
miles northwest of ground zero,
Except for the first two hours, during which
she was headed into an 8 knot wind, she was maneuvered in a figure eight.
Her
speed of advance was just slightly over 4 knots in order to maintain steerage.
The ship was, therefore, adecuately orientated during the fellout period for
washdown purposes.
The washdown was turned on 35 minutes after the arrival of initial fallout,
when the activity had reached 200 mrfrr.,
It was kept on about two hours after
fallout ceased for a total period of operation of 10 hours.
Fig. 2.71-4 and
2.71-5 (Project 2.71 report) show the dose rates and total dose versus time
qo
em
7
on |
—
rt
ees
rey
o
mano
Im eoD
curves for the unwashed (forward stations) and washed (eft stations) areas.
- 54 =
2
(|