OPERATION HARDTACK I PPG Time
16 May 1955
1330
Sponsor:
GMT
16 May 1958
0130
SITE:
LASL/DOD
PPG - Eniwetok -south by
SSW of Irwin about 6,000
ft from the island
nie 20t
ki"
ON
162° 10'
4b"
Site elevation:
HEIGHT OF BURST:
&
Sea level
+500 ft under
water
TYPE OF BURST AND PLACEMENT:
Underwater - Device suspended
by a cable.
Water depth
3,200 ft
PLUME TOP HEIGHT:
at 155 sec
PLUME DIAMETER:
REMARKS:
at 155 sec
1,760 ft MSL
3,400 ft MSL
"Nearly all of the total gamma dose occurred within 25 minutes after
zero time and was due to the passage of alrborne radioactive material.
Gamma doses in excess of 1O0Or occurred within the first 15 minutes at
downwind distances less than 16,000 feet. In both ihstances the
residual field due to deposited radioactive materiel was relatively
insignificant, although radioactive foam may represent a radiological
hazard."
206
oem
TATE:
TIME:
Wahoo