OPERATION REDWING -
DATE:
TIME:
PPG Time
5 May 1956
O625
LaCrosse
GMT
May 1956
1825
Sponsor:
SITE:
TOTAL YIELD: 40 kt
Depth:
Lip:
12° 33'
162° 21'
28"
18"
HEIGHT OF BURST:
Time to lst minimum:
18 to 34 msec
Time to 2nd maximum:
190 to 254 msec
Radius at 2nd maximum:
872.5 ft
Diameter:
PPG - Eniwetok - Yvonne
Site elevation:
FIREPALL DATA:
CRATER DATA:
LASL
N
&§E
Sea Level
17 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from platform on
coral soil
CLOUD TOP HEIGHT:
38,000 ft MSL (Ref 105)
40,000 ft MSL (Ref 112)
4oh ft
bu ft
15 ft
CLOUD BOTTOM HRIGHT
22,000 ft MSL (Ref 105)
13,000 ft MSL (Ret 112)
REMARKS:
The dose-rates shown for the islands of the atoll are based upon
ground and aerial surveys timude by the Radiological Sufety organization
and by Project 2.65.
The dose-rate readings in the immediate environment
of the crater were calculated from survey readings at low tide on Dt1
day and Dte days, after the reef around the crater had been flushed by
at least two high tides.
The measured field gumma decay exponent
was used to extrapolate the readings to H+l hour.
The one reading
which gave an H+l hour dose rate of 57,000 r/hr was uniquely high and
may have been due to one of the extremely radioactive, partially fused,
pieces of metal scattered about near the crater.
101