portation. Since a survey of all individualsslowed thacthere was significant contamination of
skin and clothes, prompt decontamination was instituted. Cloth es were removed and laundered,
Their skin and hair were washed repentediy with fresh waler and soap,
In many individuals,
particularly in the Marshallese, it was difficult to wash the redivgactive material from the hair
because of the heavy coconut-oil hair dressing used by these people
Table Li
EXPOSED AND CONTROL UNEXPOSED GROUPS
Approsxiniate
Group
Dcsignation
Total
Distance
Hffective
Number
in Group
from Bikini
(Naul. Miles)
Time of
Fallout
135
H+ G8 he
Americans,
28
Exposed
Rongerik
:
Americans,
Control
Instrument
Readings
Best Estimate
Used in Dose
Calculations
of Total Gamma
Dose in Airqr}*
Ho+ 28.5 hr
280 me/hr
78
(8 men}
H+ 9 days
Time of
Evacualion
.
‘
.
.
H+ 34 hr(20 men}
105
Kwaj-American
Marshallese,
64
105
H+ 4 hr
kxposed
Rongclap
.
Ailinginae
18
83
Utirik
157
270
Marshallese,
117
H+ 4 hr
H+ 22 hr
Ha SOhr
375 mr/hr
(16 people)
Ho4 5) hr
(48 people)
H+ 58hr
H+ 7 days
Started at
HWe+ 55 her
Completed at
Ho+ 78 hr
‘100 mr/ir
H+ 9 days
40 me/hr
Heo + 8 days
.
175
69
14
Control
Majuro Group
Total Exposed —267
Total Control, —222
*Seeo Section 1.4.3,
1.4
ESTIMATIONOFWHOLE BODYEXTERNALDOSE
The estimated values of external dose given in Table 1.1 were based on readings of
AN/PDR-39 field instruments. Averages of a number of dose rate measurements on each
Nt ee ee eepee pe
island at a given time were used. The readings were taken in air, approximately 3 feet above
ground, several days after the inhabitants wore evacuated. Before this time, adequate surveys
wilh well calibrated instruments had not been passible
Several variables which influence the results ure indicated below. These will be discussed
in greater detail in an addendum report on external dose, which will contain the data, methods
and calculations by which the external dose analysis was made.
4
Energy|Distribution ofthe Palloul GarnmaRadiation, Ils ¥:iriation With Time, the
Response¢of the Meleriiy Ratch.Ene rey Region and Its ‘Cor rection. Factor foc the ‘Total
DoseSpectrum
Fallout deposited as an effectively infinite plane source resulted in the dose-energy histogram shown in Fip. 1.2, Is coeryy distribution was the result of deyradation of the oripinal
16
CONFIDENTIAL
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