was felt to best express the average air-dose received by rersonnel
who spent roughly half their tine inside stmictures where the dose
rate wa3 later found to be roughly half that outdoors,
On the other
islands no such shieldiny was present, and no recietion factor was ap
plied,
The same procedure was followed for all the calculations,
TATTLE 8,1 -— Total Ganma Doses
Island
Dose
3-Hour
Fallout
r
pas
|
L2—Hour
Fallout
(r)
Ref, 16
(r)
pr ea eer
ee
106
|
86
70
78
Roagelap
209
|
182
159
17S
81
72
&9
13
12
Ly
U tirik
15
|
|
( r}
ma
flonyertki
52
hir-dose ( Point
Source of Same
Midline Dose
a2 r
Ailinginae
12-Hour Bilateral
Enercy) for Equal
|
}
:
16-Your
Fallout
(r)
2
130
270°: :
120
F
othe
20
*See Section 8.2
8.3
SOFT GAMA AND EETA COMPONENTS
In addition to the total body gamna dose, the very soft ganna and
higher energy beta radiation from the plane source contributed to the
skin dose, Further skin irradiation resulted from local deposits of
fallout material on the body surface itself, The latter is impossible
to estinate, but the former may be roughly attempted as follows,
The beta dose rate in air at a height of 3 feet above the surface
of an infinite plane contaminated with nixed 2h-hour-old fission prod-
ucts is estimated to be about three times the air carma dose (Reference
1h).
The midline ganma dose is approxinately 60 percent of the portion
oF ti aad Bae dose Uue VO loceiVY radiation or above ( heterence L3)}e
This portion, in tum, is estimated to be 60 percent of the corracted
ganma dose measured in air by a calibrated instrument, Tins, the dose.
at the surface of a phantom axposed to mixed fission product radiation
from an gxternal plane source might be expected to be about eight tines
(3/(0.4)*) the midline dose, if both occur at 3 feet off the ground,
Such a depth-dose mea surenent has in fact been mace expertnentally
ata previous field test (Keference 15), using a phantoa man exposed to
toth the initial and resiaqual radiation, The ‘decth=dos es for each situation are shown in Fisure 5,2 with all data as percent of the 3-cn
dose, with the diverging initial radiation froa the point of explosion,
the exit dose was seea to be 63 percent of the jJ-a1 dose.
Out, with
the diffuse residual field of fission product radiation, e surface dose
39