Taole |.
Comparison of gross fission product total external cases Tor
computer
calculations
S$ trauss+?
Evacuation Time
Atoll
(hours)
Rongel2o
(northern part)
Rongelao
(soutneastern part)
Ailinginae
(Sifo [stand)
Rongertk
(southeastern part)
Utirik
vs.
estimates
Present
Calculations
(racs)
by
Previous
Estimates
Dunninat9!
(roentgens)
Ref.
51
1300
2000
(6]
51
110
173
{5]
53
24
<100
{5}
30
340
78
(5]
~v10
(5]
78
0.33
and
With the modified MATHEW-ADPIC cade 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 ?a 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.
Indivicual Nuclices
Calculations “ere mace of instantaneous and time-integrated concentrations
at 2 m above the surface for the several atolls affected by Castle-Bravo.
nuclides
eonsid2zred
were
Te-129,
I[-L31l,
[-138,
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 Utirtk atoll. The surface concentrations for
Dongalac. Soth the northern and southeastern darts of the atoll, and for Ailiginue
Atoll are presented in Figures 3a to 5e. The time of arrival of the first Bravo debris
is in agreement with reports made by the inhabitants.