Title :
A silicon Compton imager
Author :
Wulf, Eric A. ; Phlips, Bernard F. ; Kurfess, James D. ; Novikova, Elena I. ; Fitzgerald, Carrie M.
Author_Institution :
Naval Res. Lab., Washington, DC
Abstract :
A Compton imager has been constructed using arrays of detectors with active areas of 11.4 times 11.4 cm2. These arrays are stacked 8 layers deep. 32-channel analog ASICs are used to read-out the arrays. This imager is a prototype for a large, high-efficiency Compton imager that will meet operational requirements of the Defense Threat Reduction Agency. The instrument created positron emission tomography (PET) images of multiple 22Na sources within its field of view. The image of a 1 mm point source had a measured full width half maximum (FWHM) of 1.25 mm or an intrinsic resolution of 0.75 mm. Using a known source position and partial energy deposition in the Compton imager, the initial gamma-ray energy was reconstructed. The energy resolution was 43 keV FWHM at 662 keV and 83 keV FHWM at 1173 keV. The resolution is dominated by the readout electronics resolution and will be improved
Keywords :
Compton effect; application specific integrated circuits; gamma-ray apparatus; gamma-ray detection; nuclear electronics; positron emission tomography; readout electronics; silicon radiation detectors; 1 mm; 11.4 cm; PET images; analog ASIC; high-efficiency Compton imager prototype; multiple 22Na sources; partial energy deposition; positron emission tomography; readout electronics; silicon Compton imager; Detectors; Energy resolution; Image reconstruction; Image resolution; Instruments; Positron emission tomography; Prototypes; Readout electronics; Sensor arrays; Silicon;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Conference_Location :
Fajardo
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596195
