23/07/20101 Student Practice in JINR Fields of Research - HPGe detectors technologies.

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23/07/20101 Student Practice in JINR Fields of Research - HPGe detectors technologies

Participants: Agnieszka Kapelak, UAM Poznań Michalina Komorowska, UW Warszawa Paulina Staszewska, UAM Poznań Supervisor: mgr inż. Dariusz Borowicz, IFJ PAN Kraków, DLNP JINR Experimental Research Department of Nuclear Spectroscopy and Radiochemistry 23/07/20102 Student Practice in JINR Fields of Research - HPGe detectors technologies

ƴ - ray spectroscopy Nuclear medicine Environmental monitoring Very good energy resolution 23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 3

23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 4 Variety of HPGe cryostats and Dewar vessels

For detecting low energies ≤ 150 keV Applied for polarization measurments Small electrical capacitance example 2 pF for X-rays detectors (typically 16 mm diameter and 5 mm thick) 23/07/20105 Student Practice in JINR Fields of Research - HPGe detectors technologies

For higher energies, up to several MeV Larger values of electrical capacitance ̴ 20 pF Commonly used crystal size - 6 cm in diameter 23/07/20106 Student Practice in JINR Fields of Research - HPGe detectors technologies

23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 7

Cutting the crystal, making of the p-n junction Cutting out the protecion ring Evaporation of Au on p-n juntion side 23/07/20108 Student Practice in JINR Fields of Research - HPGe detectors technologies

23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 9 Etching and oxidizing for an ohmic contact. Temperature evaporation of Pd and Au upon a prepared surface. Final etching and protecting the surface from the environment.

23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 10

The higher possible voltage value, the better charge collection and better time resolution 23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 11 Voltage – Current characteristic Voltage – Capacity characteristic U₀ - voltage value for which the full volume of the detector is active

Energy resolution measurments for HPGe 23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 12

23/07/ Student Practice in JINR Fields of Research - HPGe detectors technologies

Dr Stanislav Z. Pakuliak (BLTP JINR, Dubna) Dr Władysław Chmielowski (JINR, Dubna) Dr hab. Roman Zawodny (UAM, Poznań) mgr inż. Dariusz Borowicz (IFJ, Kraków / JINR, Dubna) 23/07/2010 Student Practice in JINR Fields of Research - HPGe detectors technologies 14