Tests of scintillators
-
Upload
beau-randall -
Category
Documents
-
view
27 -
download
1
description
Transcript of Tests of scintillators
![Page 1: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/1.jpg)
Tests of scintillators
CsI, CsI(Na), BGO, NaI(Tl)
CsI(Tl)
![Page 2: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/2.jpg)
CsI(Na)
170 mm
15 x 15 mm9 x 9 mm
![Page 3: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/3.jpg)
Energy of PMT 1 (small window)
Ene
rgy
of P
MT
2 (
big
win
dow
)
CsI(Na) scintillator with 2 PMT readout
Full absorption
Measurement without collimation 137Cs, 661 keV
![Page 4: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/4.jpg)
Energy of PMT 1 (small window)
Ene
rgy
of P
MT
2 (
big
win
dow
)
CsI(Na) measured with a collimated source
Sum (e
nerg
y)
Ratio (position)
![Page 5: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/5.jpg)
Energy spectrum (sum of 2 PMT’s energies)
Sum of 2 PMTs energies
Energy resolution 9.6% at 661 keVConstant for the position of the interaction
![Page 6: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/6.jpg)
Position resolution (ratio of the PMT’s energies)
Light division between 2 PMTs
15 cm
10 cm
5 cm
![Page 7: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/7.jpg)
Position resolution
0 2 4 6 8 10 12 14 160.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1 Y =0.29835-0.00312 X+0.0029 X2
light
div
isio
n be
twee
n P
MT
s
position in scintillator, cm
![Page 8: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/8.jpg)
Position resolution
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00
2
4
6
8
10
12
14
16
18po
sitio
n in
sci
ntill
ator
, cm
light division between PMTs
Position resolution 1.5 – 3 cm
![Page 9: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/9.jpg)
0.0 0.2 0.4 0.6 0.8 1.00
1
2
3
4
5ab
sorp
tion
dist
ance
, cm
energy, MeV
CsI
Ge
Mean absorption distance
![Page 10: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/10.jpg)
Readout with one PMT
1000 1500 2000 2500 3000 3500 4000 4500 50000
100
200
300
400
coun
ts
energy of one PMT
5 cm
10 cm15 cm
![Page 11: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/11.jpg)
CsI, pure
![Page 12: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/12.jpg)
Energy resolution
Resolution 17 – 19 %
Sum energy
![Page 13: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/13.jpg)
Position resolution
Light division between 2 PMTs
15 cm
10 cm
5 cm
![Page 14: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/14.jpg)
Position resolution
2 4 6 8 10 12 14 16 180.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0 Y =0.32407+0.16521 Xlig
ht d
ivis
ion
betw
een
PM
Ts
position, cm
![Page 15: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/15.jpg)
Position resolution
0.5 1.0 1.5 2.0 2.5 3.0 3.5
2
4
6
8
10
12
14
16
18
20
posi
tion,
cm
light division between PMTs
Position resolution 2 – 8 cm
![Page 16: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/16.jpg)
BGO
![Page 17: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/17.jpg)
Energy of PMT 1 (small window)
Ene
rgy
of P
MT
2 (
big
win
dow
)
BGO scintillator with 2 PMT readoutScintillator was illuminated by Cs137 source (661 keV) without a collimator
Strong nonuniformity of light yieldalong the crystal distance
![Page 18: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/18.jpg)
BGO collimated measurement
Full absorption
![Page 19: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/19.jpg)
BGO collimated measurement
Full absorption
![Page 20: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/20.jpg)
1)Light yield is strongly non uniform along the crystal distance
2)Light separates always in the same proportion between left and right sides
3)Energy resolution ≈18% (big window) ÷ 24% (small window)
BGO results
![Page 21: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/21.jpg)
CsI(Tl)
7% at 661 keV
2.5 cm2.5 cm
![Page 22: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/22.jpg)
to continue with..
![Page 23: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/23.jpg)
![Page 24: Tests of scintillators](https://reader035.fdocuments.in/reader035/viewer/2022062321/568132b3550346895d996f14/html5/thumbnails/24.jpg)