Taaie l.
Comparison of gross fission orocuct total externai doses for
computer
Strauss\?
calculations
Evacuation Time
(hours)
Atoll
Rongelao
(northern part)
Rongelap
(southeastern part)
Ailinginae
(Sifo lstand)
Rongerik
(southeastern part)
Utirik
vs.
.
estimates
.
Present
Calculations
(racs)
by
Dunningt?!
.
Previous
Estimates
(roentgens)
Ref.
51
1300
2000
[6]
51
110
175
[5]
58
24
<100
(5)
30
340
78
(5)
v10
{3]
78
and
fa]
0.33
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 can 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
cabris reaches the trade wind level; the contour pattern moves south and finally
toward the southwest.
Indivicual Nuclidas
Calculations were mace of instantaneous and time-integrated concentrations
at 2 m aoove the surface for the several atolls affected by Castle-Bravo.
nuclides
considered
were
Te-129,
[-131,
[-133,
Cs-137,
and
Eu-155.
The
These
calculations agree well with odservations at Rongelap and Ailinginae atolls, but are
too high at Rongerik and too low at Utirix atoll. The surface concentrations for
Dongelez. Doth the northern and southeastern Darts of the atoll, and for Ailiginue
Atoll are oresented ia Figures 3a to Se. The time of arrival of the first Bravo debris
is In agreement with reports made by the inhabitants.