An ISPA-camera for gamma rays

D. Puertolas, D. Piedigrossi, R. Pani, H. Leutz, F. de Notaristefani, C. D'Ambrosio
1995 IEEE Transactions on Nuclear Science  
With the recently developed ISPA (Imaging Silicon Pixel Array)-tube attached either to a planar YAlO 3 (Ce) (YAP) disc (1mm thick) or to a matrix of optically-separated YAP-crystals (5mm high, 0.6 x 0.6 mm 2 cross-section) we achieved high spatial resolution of 57 Co-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 3 cm distance by a silicon pixel chip, directly detecting the photoelectrons. The chip-anode consists of
more » ... anode consists of 1024 rectangular pixels with 75 µm x 500 µm edges, each bump-bonded to their individual front-end electronics. The total pixel array read-out time is 10 µs. 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 fibres, the ISPA-tube provides also an excellent tool in medicine, biology and chemistry.
doi:10.1109/23.489418 fatcat:j56mugfitfg3nimuwgswmtopom