100
|
SINGLE~CRYSTAL.
10
|
203
~
BACK GROUND
4
CRYSTALS ARE 4 IN. THICK
—
AND 6 iN. IN DIAMETER
—_
Lad
Z
<
TWO-CRYSTAL
a
COINCIDENCE BACKGROUND
&
als
SO
a
2
ex
1-1N. LEAD ABSORBER
SAMPLE POSITION
wv
_
a
z
= 0.01
om
o>
f
~
\s \
S
0.001
\
N
\\
—
\
~N
0.0001
.
0.00001
~\
aN
|
i
\.
|
~
~\
L
2
ENERGY, MEV
Fig. 4—Com parison of
the background of a singlecrystal detector with that
of the two-crystal multidimensional detector sysbern,
N
~ wy
|
3
100
4
.
<]
~
Lote
5
~
—
La.
L
—
Sp es
TOTAL COUNTING
Fig. 5—Total counting efficiency and total coincidence
counting efficiency of the two-
TITTTTY
So
COUNTING EFFICIENCY, %
EFFICIENCY, 2E
5
crystal multidimensional detector system.
a
TOTAL COINCIDENCE
COUNTING EFFICIENCY, 2£?
4
-
2
0.1
po
0.2
0.4
0.6 0.8 1.0
ENERGY, MEV
2
3