s
PFEECT~ 0
HO percent of the ose
cad been recered.
dose rate had fallen cess cha fo
is initial value
fered from the
laboratory,
Thos
os.)
constant
le
perce:
be otose rate ais
rate
or
ON ZING ADTATION
ne Gose at fhe center of the body is approxi-
at
ngery
> f
OO
oercent
tigher than would result
“oom a vive air dose with narrow beam geom-
ou
ry
Vigure 1. allustrates the depth dose
eve feom: an experimental situation using
fm -
oe wis
ore eee ee
I
EVACUATION
AT 51 HR
-
;
.
BO}.
|
a
|
k
I
~ 100 k— -—-
x
3
i.
-=
‘
Ww
o
Oo
.
.
x
--
—--—+
ke
a
a
2
KF sop——-.
r
.
2
4
HR
2 L__|a,
-
0
Ln wee en
40
Med
“Tah Roi.
fae deviation
commenecenone
1.23
om
t f
ue
tion is delivered from i pebutar source the usin
diffuse
440)
with depth on tessue
that resulting: from
stlom
held
the
app ueable
decrease
of
tf,
chose
- ress prodouaere ofa
oa ty ateeal oe posture
I
A-ray beam becuuse fillet) feom inverse square
In in effect neutinitee
|
a
40
50
eR
aceon funetion of time after
spherteaily orrented Co? sources with a phan-
out radiation is ~ yar i@nificantis different from:
usual laboratory sour es
“ince fallout rad.a
il
RM OUR
yamond dage
ferences the geometry oot the exposure o faci
narrow beam geometis
tao
t
— falieutun Rongelap «tall,
Geometry of the Exposure
In addition te the stose rate and enersy
such
|
Fort) Sane peter,
rom laced at thetr center, compared with a
onventional
bilateral
depth dose curve ob-
‘uined with a single source «+).
In the latter
ase, the air dese is usually measured at the
point subsequently occupied by the center of
‘he proxunal surface of the patient or animal
ath respeet to the source.
For the tield case,
(i surfaces ure “proximal,” in the sense that
ne air tose measured anywhere in the space
~ubsequenthy oecupled by the individual is the
wine
Tt is this arr dose which ts measured
ebb onstrument: it does not bear the same