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15 Author(s)
W. Neeser ; Phys. Inst., Bonn Univ., Germany ; M. Bocker ; P. Buchholz ; P. Fischer
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The DEPFET pixel Bioscope system based on a DEPFET pixel matrix provides good spatial and energy resolution in real-time digital autoradiography. Due to its very low noise and a thin entrance window the online detection of tritium without vacuum or cooling is demonstrated for the first time. To achieve this milestone a p-channel junction field effect transistor on a fully depleted high ohmic silicon substrate (DEPFET) is used as unit cell for pixel detectors providing an excellent noise performance of 158 eV FWHM at 6 keV (12 e ENC) at room temperature (300 K). 64×64 DEPFET pixel matrices with square (50 μm×50 μm) or hexagonal (50 μm×42 μm) pixels have been developed and operated successfully. First measurements result in a homogeneous charge collection efficiency on the whole matrix area and a good linearity in the X-ray range from 5 keV to 60 keV. First images taken with the square and the hexagonal pixel matrices using an 55 Fe-source as well as a `proof of principle' experiment for online 3H-detection are presented and discussed

Published in:

IEEE Transactions on Nuclear Science  (Volume:47 ,  Issue: 3 )