The Effect of Different Radiation ‘Depth-Dbose Curves on Mortality in
and in
Mammals
ose
Tullis et al. (35, 36) has studiea this in the laboratory and in the
which te
atomic bomb field
This is
target animals.
the
tests with swine as
illustrated in Figure 10, showing the sigmoid dose mortality curves for
hould be
ete LHVES
unilateral 2000 kVp x ray, bilateral 2000 kVp x ray, and
the mortality from
2G
the highly energetic prompt gamma radiation from a fission bomb.
lout field
from unilateral 2000 kVp x ray is 500 rad in air.
‘ces
resulted in an LUs 9 of 400 rad in air.
OF
the
5 a radiation
with LDso was about 230 trad in air.
n is better
-adiation to
a
homogeneity
kVp x ray,
7
rget sf fe
sortant ta
ne bone Narrow”
in distribution of dose.
o
ms
the surface
eA
galis off °%
the body in
to
in
the case of
the unilateral 2000
In
the
than 300 rad
case of
tissues proximal to and distal from the midline
In the case of the prompt gamma
tissues proximal to the midline receive a greater dose and
those
distal a lesser dose, and hence a higher and lower survival of hemopotetic
is 4
ie marrow
converted
tissues distal from the midline received much less
pilateral 2000 kVp x ray,
radiation,
important
These air doses can be
and tissues proximal to the midline received more.
air dose.
in the midling
The initial bomb gamma radiation
The differences are explained in part by lack of
receive a greater absorbed dose.
this
Bilateral 2000 kVp
midline tissue doses based on comparative studies on depth-dose curves to
300, 220, and 184 rad.
gughout
The LDso
i:
.
e
ster. cells on opposite
‘
As a result of
sides of
the midline.
the effect of energy and peometry ot expusure, measured
radiation doses in air are of relatively little use in predicting
* survival.
we
For practical clinical management,
it is the opinion of
this
“author that one should be guided by the clinical and hematologic cource av’
a Fi a by estimates of radiation doses in air or doses estimated by biological
“dosimetry.
Fallout Kaaiation Exposure of the Marshallese
The energy of a fallout field determines, in addition to the geometry
exposure,
the depth-dose pattern.
9 4-day old fallout.
Figure 11 shows the. energy spectrut:
The original source is the energy of
sSions frou the major components of the 4-day fallout.
inherent yauma
The solid hlack
Stogram is calculated distribution of energy taking into account Compton
ttering.
Thus the energy to which an individual is exposed varies from
rgucld keV with little penetration to a peak at 1600 KEV.
The effect of
ea energy distribution in the geometry of exposure on depth-duse curves
e shown in Figure 12.
The depth-dose curves of a fallout field and
~103-