Refine
Year of publication
- 2002 (232) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (53)
- Fachbereich Elektrotechnik und Informationstechnik (29)
- Fachbereich Wirtschaftswissenschaften (29)
- Fachbereich Energietechnik (27)
- Fachbereich Luft- und Raumfahrttechnik (21)
- Fachbereich Maschinenbau und Mechatronik (21)
- Fachbereich Chemie und Biotechnologie (18)
- INB - Institut für Nano- und Biotechnologien (18)
- IfB - Institut für Bioengineering (12)
- Solar-Institut Jülich (10)
Has Fulltext
- no (232) (remove)
Document Type
- Article (166)
- Book (32)
- Conference Proceeding (25)
- Part of a Book (3)
- Patent (3)
- Doctoral Thesis (1)
- Report (1)
- Review (1)
Keywords
- Energierecht (1)
- Erneuerbares Energiengesetz (1)
- Kohlefeuerung (1)
- Reduktion <Chemie> (1)
- Rohrreaktor (1)
- Stickstoffoxide (1)
- Wirbelschichtfeuerung (1)
The optimization of light output and energy resolution of scintillators is of special interest for the development of high resolution and high sensitivity PET. The aim of this work is to obtain statistically reliable results concerning optimal surface treatment of scintillation crystals and the selection of reflector material. For this purpose, raw, mechanically polished and etched LSO crystals (size 2×2×10 mm3) were combined with various reflector materials (Teflon tape, Teflon matrix, BaSO4) and exposed to a 22Na source. In order to ensure the statistical reliability of the results, groups of 10 LSO crystals each were measured for all combinations of surface treatment and reflector material. Using no reflector material the light output increased up to 551±35% by mechanical polishing the surface compared to 100±5% for raw crystals. Etching the surface increased the light output to 441±29%. The untreated crystals had an energy resolution of 24.6±4.0%. By mechanical polishing the surface it was possible to achieve an energy resolution of 13.2±0.8%, by etching of 14.8±0.7%. In combination with BaSO4 as reflector material the maximum increase of light output has been established to 932±57% for mechanically polished and 895±61% for etched crystals. The combination with BaSO4 also caused the best improvement of the energy resolution up to 11.6±0.2% for mechanically polished and 12.2±0.3% for etched crystals. Relating to the light output there was no significant statistical difference between the two surface treatments in combination with BaSO4. In contrast to this, the statistical results of the energy resolution have shown the combination of mechanical polishing and BaSO4 as the optimum.
Gute Chancen im Maschinenbau
(2002)
Chancen im Maschinenbau
(2002)
Gute Chancen im Maschinenbau
(2002)
Pro-Forma-Angaben
(2002)
Aachen: Colourdome
(2002)
An experimental command and control information system based on Enterprise Java bean technology
(2002)
Optimization of Interplanetary Rendezvous Trajectories for Solar Sailcraft Using a Neurocontroller
(2002)
Partikelmesstechnik
(2002)
The hybrid K+/Ca2+ sensor based on laser scanned silicon transducer for multi-component analysis
(2002)
Sterne und Weltraum
(2002)
Kosmologie
(2002)
Macroporous silicon has been etched from n-type Si, using a vertical etching cell where no rear side contact on the silicon wafer is necessary. The resulting macropores have been characterised by means of Scanning Electron Microscopy (SEM). After etching, SiO₂ was thermally grown on the top of the porous silicon as an insulating layer and Si₃N₄ was deposited by means of Low Pressure Chemical Vapour Deposition (LPCVD) as transducer material to fabricate a capacitive pH sensor. In order to prepare porous biosensors, the enzyme penicillinase has been additionally immobilised inside the porous structure. Electrochemical measurements of the pH sensor and the biosensor with an Electrolyte/Insulator/Semiconductor (EIS) structure have been performed in the Capacitance/Voltage (C/V) and Constant capacitance (ConCap) mode.
Learning from Brachelen
(2002)