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HK: Fachverband Hadronen und Kerne

HK 54: Nuclear Physics Applications

HK 54.4: Talk

Wednesday, March 18, 2009, 15:15–15:30, H-ZO 100

Pulse shape comparison procedure to characterise position sensitive HPGe detectors — •Namita Goel, Cesar Domingo Pardo, Tobias Engert, Juergen Gerl, Ivan Kojouharov, and Henning Schaffner — GSI Helmholtzzentrum fur Schwerionenforschung mbH, 64291,Darmstadt,Germany

A new tool to experimentally characterize 3D position sensitive HPGe detector based on pulse shape comparison procedure is proposed and implemented. It is a novel technique for measuring the HPGe detector pulse shapes as a function of the γ-ray interaction position inside the detector volume. The system also utilizes the principles of positron emission tomography to speed up the scanning time. An application of the Na-22 source emitting pairs of 511 keV gammas in back to back directions allows creating a "collimator-free" scanner, where pulse shapes for many lines across the detector or even the whole detector can be registered simultaneously. A position sensitive γ-ray scintillator detector (PSD) oriented towards the source is used for registration of 511 keV gammas in coincidence with the HPGe detector. This PSD is based on a crossed-wire anode position sensitive photomultiplier tube (PSPMT).The main difference with respect to similar existing devices is the individual multianode readout (IMAR) approach. The method allows to exploit better the intrinsic characteristics of the PSPMT, thus yielding better position linearity, improved spatial resolution of about 1 mm(FWHM) . This position sensitive γ-ray scintillator detector fulfills the requirements for its implementation in our scanning system.