ite. cei te in tistere
vkposure
ere as noted in
iy, , une dese at
a Ulver. proximal
wae
wf
-
HEbuGtrat:
be pd artom
Lbs
2
o-
,.
ay
>
oe Serenee
woe
‘
?
12
Pre ean Cpe timen tal
see eye
yume
bo Lag a
eoystisye,
apie
Lune
io
_7
noe
+
~
~
7
we
.
wot
~
be
TG
oy
hoo
oT EL em
Cov? scurce,
teth are
a
if the unit was wide emagh to include the whole
airedcse around the cireumfeirence was Lore used
ceenetry and the proximal airedece ayain
Fe
44
accesntly.
aivedcse at all points later
1
Splielt for the diftice case, while
Le used
the tliateral care,
«
intlar eo: parison for OCCeiVe, G,Semm, cepperthe diffuse vescetry that of a plane sather
than
stiy, This was reds:ced in this case ty rotation
cha ter in the team ef a stationary 4eray unit.
‘
pat
.
~
“rep of
FG
135
in
the ee
vvident that for both these energies (the +
-,
-
oriented
terak Ceptiecuse curse crasured
single
-
“+
fonily
Gh panto war placed at the centaur co” the
the Xepay beam boing atuut 90 av), the Sitfucs-acerew.
tic for either 2 a radians (plane) or yw steracdians
etry is almost the same, That is, the sicliue
cnt higher
Ete
and the S-en dase is 35 pet
airedose (meacured proximally) would yy
UB
boat
:
osure, It is therefure assumed that’
t}
vyhrcu chou t the field exposures,
ay.
wat.
airedcose values caleulated from the survey meter
41) sihould be wultirtied by 1,5 in order to cunpare
hat of a Lilateral cxrosure to a scurce witn the same
ib: tion bu t using a point scuree ,ecmetry and a proximally
_ al turmatively, if a point suurce of higher eneryy,
bilaterally in the came nay to simulate a field
; the hiipher paoma cempenents, Bee the peter energy
rule
be unity,
In this case,
syecify a Lilateral
diffuse euretry,
ah sline dose equal to thet wi
Lredoce cheuld te the ditfuse rield ablredsuce «caser
e
ane
cubtiplied by (1,09 « 1,5) onmly.
disuusced Curther in Chapter 3,
35