INPUT DATA
Surface meteorological observations were avaltiaole from some atolls and from
the U.S.S. Curtiss which cruised south of Bikini; however, since the larger particles
fall rapicly from the debris cloud to tne 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 topography, cell sizes of 34 km (east-west) by 17 km
‘north-south}, and 1 km in the vertical, stem and cap debris cloud geometries at
Stabilization
time, source rates
for both gross
fission
produets and selected
individual nuclides, and particle size spectrum parameters.
CALCULATIONS
Geoss Fission Products
Tne time-integrated external dose pattern (in rads} due to gross fission
oroducts from detonation time to evacuation time of Rogelap atoll (51 hours) ure
shown in Fig. 1.
Tne numbers next to Ailinginae, Rongerix, and Utirik atolls are
integrated values uo to the time people were evacuated from those atolls.
For
comparison,
the
value
Strausst®! are given in Table
1.
of
total
dose,
Note that
.
estimated
by
.
[3
Dunning. j
and
the agreement is very good for
Rongelap and Ailinginae atolls. However, calculations for Rongertk and Utirik ave
at odds with earlier estimates. The code calculations for Rongerik are higher, while
those for Utirik are lower.
This variation appears to be in part a prablem of
"tuning"; also a possible variation in wind directions and speeds at late times when
the only wind observations were from the U.S.S. Curtis, south of Bikini (some
distance from the atolls of concern) may be an explanation.