Title :
A portable gamma camera for radiation monitoring
Author :
Guru, S.V. ; He, Z. ; Wehe, D.K. ; Knoll, G.F.
Author_Institution :
Dept. of Nucl. Eng., Michigan Univ., Ann Arbor, MI, USA
fDate :
8/1/1995 12:00:00 AM
Abstract :
A compact gamma camera capable of imaging high energy gamma rays (up to 2 MeV) is currently being developed for nuclear industrial applications. This camera uses a three inch square position sensitive photomultiplier tube (PSPMT) [Hamamatsu, R-2487-05] coupled to a NaI(Tl) scintillator. The incoming gamma ray direction is determined by a segmented collimator. The camera exhibits energy resolutions of 17% FWHM at 122 keV and 12% FWHM at 662 keV. With the collimator design used, an angular resolution at the source plane of 6° FWHM was measured for 412 keV. Images have been obtained using gamma ray sources up to 1 MeV using this system. The image reconstruction technique used is presented in detail. Corrections for the non-uniformities across the face of the PSPMT are implemented to improve the spatial and spectral information content in the final image
Keywords :
gamma-ray detection; photomultipliers; portable instruments; position sensitive particle detectors; radiation monitoring; solid scintillation detectors; 122 keV; 2 MeV; 412 keV; 662 keV; Hamamatsu R-2487-05; NaI(Tl) scintillator; NaI:Tl; angular resolution; energy resolution; gamma ray direction; image reconstruction; portable gamma camera; position sensitive photomultiplier; radiation monitoring; Biomedical imaging; Cameras; Collimators; Data acquisition; Energy resolution; Gamma rays; Optical imaging; Radiation monitoring; Robot vision systems; Textile industry;
Journal_Title :
Nuclear Science, IEEE Transactions on
