OPERATION REDWING -
TATE:
TIME:
PPG Time
11 Jul 1956
0556
Navajo
GMT
Sponsor:
10 Jul 1956
1756
SITE:
LASL
PPG - Bikini - South of Dog
11° 39' 48" WwW
165° 23' 1h" &§E
Site elevation:
HEIGHT OF BURST:
Sea level
15 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water; center of gravity
approx. 15 ft above surface
of water;
depth to bottom-215 ft
CLOUD TOP HEIGHT: 85,000 ft MSL
CLOUD BOTTOM HEIGHT: 51,200 ft MSL
REMARKS:
The on-site fallout pattern was drawn from island readings taken by
scientific projects supplemented by fallout sample collections on rafts
and barges in the lagoon.
The survey readings were obtained on D-day.
A gamma decay exponent
determined from laboratory gamma
decay measurements, was used to convert the D-day readings to Ht+tl
hour values.
Light fallout occurred on Nan approximately 18 hours
after detonation, with peak yvamm intensities of 22 mr/hr.
The off-site fallout pattern was drawn from aerial and oceanographic
surveys:
The oceanographic surveys used detector probes for measuring
the dose rate at depths to and below the thermocline.
Water sampling
equipment was used for taking of surface samples and for the collection
of samples from any desired depth.
The dose rate readings were extrapo-
lated to Htl hour by using the decay measurements of the samples
collected.
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