Taoie |.
Comparison of gross fissicn product total external doses for
computer
Strauss)?
calculations
Evacuation Time
Atoll
(hours)
Rongelao
(northern part)
Rongelao
(southeastern part)
Allingingae
(Sifo Is!and)
Rongertk
(southeastern part)
U tirtk
vs.
estimates
Present
Caleulations
{racs)
by
Previous
Estimates
Dunning?!
(roentgens)
Ref.
51
1300
2000
{5]
51
110
175
(5]
58
24
<100
(5]
30
340
78
[5]
vV10
[3]
78
0.33
and
With the modified MATHEW-ADPIC code suite, it is possible to calculate the
instantaneous immersion dose rate from gross fission products as a function of
time.
Tnis ean be done for any time inteval.
Figures 2a to 2f show surface
immersion dose rate contours for every three hours from one hour after Bravo cloud
stabilization time to H+16 hours.
Note that after an easterly traverse, most of the
cebris reaches the trade wind level; the contour pattern moves south and finally
toward the southwest.
Individual Nuclidas
Calculations were made of instantaneous and time-integrated concentrations
at 2 m g2o0ve the surface for the several atols affected by Castle-Bravo.
nuclides
considered
were
Te-129,
[I-131,
I-133,
Cs-137,
and
Eu-155.
The
These
calculations agree well with observations at Rongelap and Ailinginae atolls, but are
too high at Rongerik and too low at Utirik atoll. The surface concentrations for
nongalac. Doth the northern and southeastern parts of the atoll, and for Ailiginae
Atoll ace presented in Figures 3a to Se. The time of arrival of the first Bravo debris
is In agreement with reports made by the inhabitants.