SLIDE 34
Integrated expousre and whole body absorbed dose. The total igtegrated
exposure from the onset of fallout to evacuation was 7.2 x 10
“C kg
(280 R)
one meter above the surface
of Rongelap Island.
This estimate accounted for
the build-up of fallout on the ground which was previously described by us and
photons from 142 nuclides. A plot of the integrated exposure versus time is
given here.
The total inte
fegrated exposure at one meter above the surface of
tent Island was 4.4 x 10° a°6 kg
(16 R).
(170 R) and at Utirik Island 4.1 x 10
These exposures were for the period of time from the onset of
fallout up to evacuation, March 1 to 3, 1954.
These air exposure estimates lead us to agree with whole body and
external thyroid absorbed dose estimates made by Cronkite et.al. (Cr56).
After the miitiplicative factor was applied to correct for living pattern,
etc. we obtained a whole body dose estimate of 1.9 gray (190 rad) at
Rongelap.
This compared to 1.75 gray (175 rad) estimated by Cronkite.
INTEGRATED EXPOSURE
J
{
i
q
l
J
300+
0.0774
9
I
9°
RONGELAP
oO
J
t
10.0516
100-
0.0258
,
{0
Bw
et
*
:
EXPOSURE ONE METER ABOVE SURFACE, C kg"!
I
°o
EXPOSURE ONE METER ABOVE SURFACE,R
i)
nN
oI
a
3°
a
wn
i
ane
20
30
I
40
UTIRIK
|
50
HOURS POST DETONATION
i
60
70