Title :
A germanium-based, coded aperture imager
Author :
Ziock, Klaus P. ; Madden, Norm ; Hull, Ethan ; Craig, William ; Lavietes, Tony ; Cork, Chris
Author_Institution :
Lawrence Livermore Nat. Lab., CA, USA
Abstract :
We describe a coded-aperture based, gamma-ray imager that uses a unique hybrid germanium detector system. A planar, germanium strip detector, 11 mm thick is followed by a coaxial detector. The 19×19 strip detector (2 mm pitch) is used to determine the location and energy of low energy events. The location of high energy events are determined from the location of the Compton scatter in the planar detector and the energy is determined from the sum of the coaxial and planar energies. With this geometry, we obtain useful quantum efficiency in a position-sensitive mode out to 500 keV. The detector is used with a 19×17 URA coded aperture to obtain spectrally resolved images in the gamma-ray band. We discuss the performance of the planar detector, the hybrid system and present images taken of laboratory sources.
Keywords :
gamma-ray detection; germanium radiation detectors; nuclear electronics; position sensitive particle detectors; 11 mm; 500 keV; Compton scatter; Ge; URA coded aperture; coaxial detector; gamma-ray imager; germanium strip detector; germanium-based coded aperture imager; hybrid germanium detector system; low energy event; position-sensitive mode; quantum efficiency; Apertures; Coaxial components; Energy resolution; Event detection; Gamma ray detection; Gamma ray detectors; Geometry; Germanium; Particle scattering; Strips;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2001 IEEE
Print_ISBN :
0-7803-7324-3
DOI :
10.1109/NSSMIC.2001.1009692
