em Steen bale oomstata
,
errr
(1) If wind shear is <10° for the levels in question, ainer
axis is
1/8 to 1/4 of the major axis (wnich is the entire vector for levels
looked at).
(This is case of 0-5,000 feet winds and 5-20,000 feet winds.)
se
a
(2) If wind shear is >10° but <120°, minor aris is ¥ of asjer
This is case for 20,000 feet winds to tropopause, and sonembat less
ae,
axis.
for 65,000 to y5,000 feet winds.
(3) If shear at levels making up vector under study is >120°
draw circle with diameter = to entire resultant vector.
The relatively light fall-out at Utirik (252 of the hot ares), hizher levels
of intensity at Bikar (East and downwind of the hot area, i.e..6 r/hr at 3
plus 33 hours almost in downwind line with the superimposed ellipses or hot
areas but definitely beyond the hot shadow), confirm the belief in che asscsed
area of hot fall-out pattern above.
me
ee
the picture for heaviest fall-out patterns north of this area is estab: ished.
eer
From initial land survey reports on Acngelap Atoll with levels at
“4
2e
Erippu Island (NB part of Atoll) still at 2.8 to 3.5 r/hr on B plus 7 days,
.
1. From overall fall-out picture, it is concluded that fall-out aay
nave reached Rongelap Island and Ailinginae later than the pessimistic tise
of H plus 5 and # plus 4 hours, respectively.
agrees Air vebmomsdien ate Arete
CONCLUSIONS ;
ortho (SSE of the area and fro= Gro=d
Zero) received practically nothing because resultant vector wind speed froa
the stem and, perbaps some of the mushroom fringe, was so low in velocity
Nevada Proving Grounds over last 3 years, and (3) experience and data f>oa
IVY-HIKE (limited cross-wind and upwind) end CzSTIS-ErayC itself.
4e Rongerik radiation intensity levels are ‘mown at caset and evecuatica
time; calevlated roentgen dosage agrees with actual observations froz fits
badges at this site
.
[s) acd
Inelcsure 6
ae
ee ae
Boe
se Bode n>
ae
bait cam
od
5. The heaviest fall-cut pattern wes expected to pass north of
eest cortheast from Ground Zero.
ne
is based ons (1) logical use of wind patterns existing during shot tine to _
fall-out, (2) multiple shot (tower or ground) fall-out pattera data froa
aE
because it does not tell exactly rhen the fall-out errives. Eowever, ‘* ‘
apparent that the 200-300 plus roentgens lifetizne dosage line sessed os or
close to Ailinginae, Rongelap Island and Rongerik which are at €0-i00 alles
in cases of Ailinginse and Rongelap and 130 miles to Rengerik from sround
Zeroe The 1,000 plus roentgens lifetime dosage lines are exceeded as cne goes
north from Rongelap Island to northern islands of that atoll. This analysis
Re
This type of analysis gives a feeling only for pattern of fall-out
eekan)
3-
;
through the SB to South from Ground Zero. Zniwetok received at about E pics
11 hours a build up to about 10 mr/hr for a period of about cive hours.