([NPUT DATA
Surface meteorological observations were avalizole from some atolls anc from
the U.S.S. Curtiss which cruised south of Bikini; nowever, since the larger oacticlas
fall rapialy from the debris cloud to the surface and spend little time near the
surface, not many surface reports were used. Of far greater importance are the
upper air wind observations taken at four sites near Bikini atoll. Other significant
input data consisted of a flat topograohy, cell sizes of 34 km (east-west) by 17 km
fnorth-south}, and | km in the vertical, stem and cap debris cloud geometries at
Stabilization
time,
source
rates
for
both
gross
fission
products
and
selected
individual nuclides, and particle size spectrum parameters.
CALCULATIONS
Geoss Fission Products
The time-integrated external dase oattern (in rads) due to gross fission
oroducts from detonation time to evacuation time of Rogelao atoll (51 hours) are
snown in Fig. 1.
Tne numbers next to Ailinginae, Rongerix, and Utirik atolls are
integrated values up to the time people were evacuated from those atolls.
For
:
[6
Strauss”
comoarison.
the
value
.
‘
are given in Table
1.
of total dose,
Note that
estimated
by
Dunning
(3]
and
the agreement is very good for
Rongelap and Ailinginae atolls. However, calculations for Rongertk and Utirik ace
at odds with earlier estimates. The code calculaticns for Rongerik are higner, while
those for Utirik are lower.
This variation appears to be in part a problem of
"tuning'’s also a possible variation in wind directions and speeds at late times when
the only wind observations were from the U.S.S. Curtis, souta of Bikini (some
distance from the atolls of concern) may be an explanation.