Transcript HPGe detectors technology

Experimental Research Department
of Nuclear Spectroscopy and
Radiochemistry
Participants:
• Łukasz Fulek, AGH UST Cracow
• Paweł Gaik, AGH UST Cracow
Supervisor:
mgr inż. Dariusz Borowicz, IFJ PAN Cracow, DLNP JINR
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Student Practice in JINR Fields of Research HPGe detectors technologies
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• ƴ - ray spectroscopy
• Nuclear medicine
• Environmental
monitoring
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PLANAR DETECTORS
 Detecting low energies up to 150 keV
 Polarization measurements
 Small electrical capacitance
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COAXIAL DETECTORS
 For high energies up to a few MeV
 Diameter of detectors commonly used
– 6 cm
 Larger values of electrical capacitance
than for planar detectors ( up to 20 pF)
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 Large volume
 Electrical capacitance lower than 1 pF
 detection threshold 250 eV
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SEGMENTED HPGe DETECTORS
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Cutting out the protecion ring
Making of the p-n junction
Evaporation of Au on p-n juntion side
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Temperature evaporation
of Pd and Au upon a prepared
surface.
Etching and oxidizing for an
ohmic contact.
The last etching and passivation
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Producing our own detectors
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Results
AFTER
BEFORE
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241
Am
3000
l.zliczen
2500
2000
1500
FWHM
238eV
1000
500
0
5
10
15
20
25
30
E[keV]
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SPECIAL THANKS TO
• Dr Stanislav Z. Pakuliak (BLTP JINR, Dubna)
• mgr inż. Dariusz Borowicz (IFJ, Cracow / JINR, Dubna)
• Dr hab. Roman Zawodny (UAM, Poznań)
• Dr Władysław Chmielowski (JINR, Dubna)
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