[INPUT DATA
Surface meteorological observations were avaliaole from some atolls anc from
the U.S.S. Curtiss which cruised south of Bikini; however, since the larger particles
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 topography, cell sizes of 34 km (east-west) by 17 km
(morth-—south}, and 1 km in the vertical, stem and cap cebris cloud geometries at
stabilization
time, souree rates
for both
gross
fission
products and selected
individual nuclides, and particle size spectrum parameters.
CALCULATIONS
Gross Fission Products
The time-integrated external dose oattern (in rads) due to gross fission
oroduects from detonation time to evacuation time of Rogelap atoll (51 hours) ure
snown in Fig. 1.
The numbers next to Ailinginae, Rongerik, and Utirik atolls are
integrated values up to the time peoole were evacuated from those atolls.
For
comparison,
the
value
of
total
dose,
Note that
estimated
by
Dunning’!
and
Strauss“! are given in Table
1.
the agreement is very good for
Rongelap and Ailinginae atolls.
However, calculations for Rongerik and Utirik are
at odds with earlier estimates. The code ealculaticns for Rongerik are higher, while
those for Utirik are lower.
This variation appears to be in part a problem of
"tuning"; also a possible variation in wind directions and speeds at late times when
the onlv wind observations were from the U.S.S. Curtis, south of Bikini (some
distance from the atolls of concern) may be an explanation.