Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

Silicon Drift Detectors (SDDs) are used as low-capacitance photon detectors for the optical light emitted by scintillators. The scintillator crystal is directly coupled to the SDD entrance window. The entrance window's transmittance can be optimized for the scintillator characteristic by deposition of a wavelength-selective anti-reflective coating. Compared to conventional photomultiplier tubes the SDD readout offers improved energy resolution and avoids the practical problems of incompatibility with magnetic fields, instrument volume and requirement of high voltage. A compact imaging spectrometer for hard X-rays and γ-rays has been developed by coupling a large area (29 × 26 mm2) monolithic SDD array with 77 hexagonal cells to a single non-structured CsI-scintillator of equal size. The scintillation light generated by the absorption of an energetic photon is seen by a number of detector cells and the position of the photon interaction is reconstructed by the centroid method. The measured spatial resolution of the system (≤ 500 μm) is considerably smaller than the SDD cell size (3.2 mm) and in the order required at the focal plane of high energy missions. The energy information is obtained by summing the detector cell signals. Compared to direct converting pixelated detectors, e.g. CdTe with equal position resolution the scintillator-SDD combination requires a considerably lower number of readout channels. In addition it has the advantages of comprehensive material experience, existing technologies, proven long term stability, and practically unlimited availability of high quality material.

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

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Extract Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007

Extract Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007

Extract HTML view is not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button. Extended abstract of a paper presented at Microscopy and Microanalysis 2005 in Honolulu, Hawaii, USA, July 31--August 4, 2005

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Es wurde bei 11 Schweinen eine orthotope Xenotransplantation der Hundeleber durchgeführt. Die Überlebensdauer war durchschnittlich 4,3 ± 1,5 Std. Die Todesursachen waren generalisierte Blutungen. Um die hyperakute Abstoßungsreaktion zu bremsen, wurden vor der Verpflanzung der Hundeleber bei 5 Fällen Hundeniere und Hundemilz je 20 min und bei 5 anderen Fällen eine zweite Hundeleber am Femoralkreislauf eingeschaltet. Wegen der stark aufgetretenen Kreislaufreaktion (Tachykardie und Hypotonie) war die Überlebensdauer noch kürzer. Aus gleichen Gründen wurden hohe Dosen Prednisolon intraund postoperativ bei 5 Fällen verabreicht. Die Überlebensdauer von 4 Schweinen war 9,0 :L 2,2 Std. Ein Schwein überlebte 5 Tage. Bei diesem Schwein wurde Hundeproteinsynthese beobachtet.