Taoie |.
Comparison of gross
fission procuct
total external. doses
for
.
.
Ps
computer
Strauss?
calculations
(hours)
Rongeiap
(northern oart)
(racs)
51
nongelao
(southeastern part)
Rongerik
(southeastern part)
Ctirik
by
Previous
Estimates
Dunning!
(roentgens)
2000
(6]
110
173
[5]
58
24
<100
{5}
30
340
78
.(5]
vV10
{5]
=
78
0.33
and
Ref.
1300
51
Ailinginae
(Sifo Island)
estimates
Present
Caleulations
Evacuation Time
Atoll
vs.
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.
This 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 Nuclides
Calculations were made of instantaneous and time-integrated concentrations
at 2 m g50ve the surface for the several atolls affected by Castle-Bravo.
nuclides
considered
were
Te-129,
I[-131,
I-138,
(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
mangalac. Doth the northern and southeastern darts of the atoll, and for Ailiginue
Atoll are presented in Figures 3a to Se. The time of arrival of the first Bravo debris
is in agreement with reports made by the inhabitants.