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An ISPA-camera for gamma rays

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6 Author(s)

With the recently developed ISPA (imaging silicon pixel array)-tube attached either to a planar YAlO3(Ce) (YAP) disc (1 mm thick) or to a matrix of optically-separated YAP-crystals (5 mm high, 0.6×n.6 mm2 cross-section) we achieved high spatial resolution of 57Co-122 keV photons. The vacuum-sealed ISPA-tube is only 4 cm long with 3.5 cm diameter and consists of a photocathode viewed at 3cm distance by a silicon pixel chip, directly detecting the photoelectrons. The chip-anode consists of 1024 rectangular pixels with 73 μm×500 μm edges, each bump-bonded to their individual front-end electronics. The total pixel array read-out time is 10 ps. The measured intrinsic spatial resolutions (FWHM) of this ISPA-camera are 700 μm (planar YAP) and 310 μm (YAP-matrix). Apart from its already demonstrated application for particle tracking with scintillating fibers, the ISPA-tube provides also an excellent tool in medicine, biology, and chemistry

Published in:

IEEE Transactions on Nuclear Science  (Volume:42 ,  Issue: 6 )