Preparation - Positron Annihilation in Halle - Martin-Luther ...
Preparation - Positron Annihilation in Halle - Martin-Luther ...
Preparation - Positron Annihilation in Halle - Martin-Luther ...
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<strong>Preparation</strong> and Exam<strong>in</strong>ation<br />
of 22 Na 2 CO 3 Sources for<br />
<strong>Positron</strong> <strong>Annihilation</strong> Lifetime<br />
Spectroscopy (PALS)<br />
Jörg Haeberle<br />
Mart<strong>in</strong>-<strong>Luther</strong>-Universität <strong>Halle</strong>-Wittenberg
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
preparation table<br />
mattes of lead covered<br />
with Al-foil<br />
red light<br />
pipette<br />
2
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
preparation team<br />
3
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
V Vial<br />
4
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
liquefy the source material<br />
just a few drops of<br />
aqua. dest<br />
depends on <strong>in</strong>tended<br />
source activity<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
drip the source material<br />
mark whrere you drip the<br />
source materail<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
dry the source material<br />
7
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
measurement of activity<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
measurement of activity<br />
distance law<br />
Г ( H 22 A[GBq]=<br />
Na)= 322 μSv*m²/(h *Gbq)<br />
H∗r²<br />
ΓH from lifetime spectrum<br />
Bgr /ch<br />
A[Bq]=<br />
ps<br />
ch ∗tot.counts<br />
∗10 12<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
seal the source<br />
10
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
11
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
12
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
13
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
14
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
15
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
stamp out the source<br />
16
<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
exam<strong>in</strong>ation setup<br />
1 mm thick plastic sc<strong>in</strong>tilator<br />
detect positrons only<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
PALS source<br />
superposition of both<br />
normal light<br />
pictures<br />
complete darkness<br />
exposure time 2 m<strong>in</strong>utes<br />
use grafic programm<br />
f = 2.8, ISO = 3200<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
weak light source (diode)<br />
PALS source<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
FAIL<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
Ti source for PALS <strong>in</strong> liquids<br />
Titanium is waterproof – Kapton is not !!!<br />
4 μm thick Ti-foil<br />
silicone as glue<br />
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<strong>Preparation</strong> Exam<strong>in</strong>ation<br />
beam source<br />
22
time resolution from a<br />
Hamamatsu H3378-50<br />
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Thank you for your<br />
attention!<br />
http://positron.physik.uni-halle.de/<br />
http://www.quantumdiaries.org/wpcontent/uploads/2011/06/impositron.png<br />
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