OPERATION CASTLE -
DATE:
TIME:
PPG Lire
1h May 1954
0620
Nectar
GMT
Sponsor:
13 May 1954
1820
SITE:
LASL
PPG - Eniwetok -
Ivy Mike Crater
21° hot
TOTAL YIELD:
162? 1l'
1.69 Mt
Site elevation:
HEIGHT OF BURST:
oak"
Wy"
oN
OR
Sea level
7 ft
CLOUD TOP HEIGHT:
‘71,000 ft M5I,
CLOUD BOTTOM JESIGHT:
40,500 ft MSL
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on water
REMARKS:
The on-site fallout pattern was drawn from Radiological Safety
orgunization data and by converting the readings obtained from fallout samples to equivalent dose-rate readings over land.
Since the
fallout went in a northerly direction from ground zero very few of the
collecting stations received significant fallout.
The fallout collected was primarily upwind fallout.
Aerial survey was used for measurements north of the atoll, and two tugs gathered water sampies throughout the fallout area.
Anulyses of the water samples, combined with an
estimate of the depth of mixing, served to determine the land-equivalent
exposure rate at a number of points.
The aerial survey served to fill
in the contours.
91