tee
nf
*
eae
we
e
.
eo
7
*
8
ef
eoe
os
9868
1
oe
»
4ae
*
‘
a+bhee
aa
.
1§ ESTIMATEOFBIANIMALSKIN DOSE FROMTHEGROUND
In addition to the toial body gamma dase, the very sott gamma and higher enercy beta
radiation from the jeans source contribuled to the skin dose.
Further skin irradiation re-
sulted fram local Gepesits of fallout material on the body surface itself. The latter is impos-
sible (o estimate, tual tre former may be roughly allempted as follows.
The beta dose rele in air ala height of 3 feet above the surface of an infinite plane contaminated with mixed 24-hour-old fission products is estimated to be about three times the
1000 pa
t
7
t
|
_
S00;~
a.
Oo
o
x
<x
o
4
&
9
O
t
;
,
&
bil
63
S|
OIE
0.
——
~
}
A
a
(Vi
a
”
!
!
vee ee ee Dc we ee ee Se
A
|
5
y
Sj
<=
I
100 9
ie |
~.
'
i
Py
bin
—z
2
!
I
Ww
ta
I
I
f
i
>|
t
i
q
20018
8)
wf
INITIAL RADIATION
,
6
|
r
50 }-
>
-
<
<\
|
0
.
|
Te)
[
20
|
J
30
DEPTH (CM)
Fig. 1.5 Comparative Depth Doses in a Phantom Man of Initial Atomic Bomb Radiation and
Radiation fron a Field of Fissien Products
samma dose. The midline gamma dose is approximately 60 per cent of the portion of the air
uamima dose due to 80 kv radiation or above, This portion in turn is estimated to be 90 per
cent of the fgamma dose measured in air by y¥ the instrument. Thus the dose at the surface ofa
phantom exposed lo mixed {ission product radiation from an external plane source might be
expected lo be 3,'(0.6}(0.9) or about six limes the midline dose, if both occur at 3 feel off the
ground. Such a depth dose measurement has in fact been made experimentally ala previous
|
i
22
a
9009576.
Be
a
—~O—
a
°
> <
i
I
I
]
i
=
:
DEPTH DOSE IN , PHANTOM MAN-
i
NES
™
t
{
1
P= =O"" RESIDUAL FIELO
°
ki -
q
i
=
J
__,
_
i
4
Q
-
—