29th July 2011 Student Practice in JINR Fields of Research - HPGe detectors technologies 2

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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• 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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SEGMENTED HPGe DETECTORS

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Making of the p-n junction

Cutting out the protecion ring

Evaporation of Au on p-n juntion side

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Etching and oxidizing for an ohmic contact.

Temperature evaporation of Pd and Au upon a prepared surface.

The last etching and passivation

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Producing our own detectors

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Results

BEFORE

AFTER

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241Am

FWHM 238eV

0

500

1000

1500

2000

2500

3000

5 10 15 20 25 30

E[keV]

l.zliczen

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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)