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Source-Search Sensitivity of a Large-Area, Coded-Aperture, Gamma-Ray Imager.

DE200515014586

Publication Date	2004
Personal Author	Ziock, K. P.; Collins, J. W.; Craig, W. W.; Fabris, L.; Lanza, R. C.; Gallagher, S.; Horn, B. K. P.; Madden, N. W.; Smith, E.
Page Count	12
Abstract	We have recently completed a large-area, coded-aperture, gamma-ray imager for use in searching for radiation sources. The instrument was constructed to verify that weak point sources can be detected at considerable distances if one uses imaging to overcome fluctuations in the natural background. The instrument uses a rank-19, one-dimensional coded aperture to cast shadow patterns onto a 0.57 m2 NaI(Tl) detector composed of 57 individual cubes each 10 cm on a side. These are arranged in a 19 x 3 array. The mask is composed of four-centimeter thick, onemeter high, 10-cm wide lead blocks. The instrument is mounted in the back of a small truck from which images are obtained as one drives through a region. Results of first measurements obtained with the system are presented.
Keywords	Radiation detectors Gamma rays Remote sensing Coded aperture imaging
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603

Source-Search Sensitivity of a Large-Area, Coded-Aperture, Gamma-Ray Imager.

Source-Search Sensitivity of a Large-Area, Coded-Aperture, Gamma-Ray Imager.
DE200515014586

Publication Date	2004
Personal Author	Ziock, K. P.; Collins, J. W.; Craig, W. W.; Fabris, L.; Lanza, R. C.; Gallagher, S.; Horn, B. K. P.; Madden, N. W.; Smith, E.
Page Count	12
Abstract	We have recently completed a large-area, coded-aperture, gamma-ray imager for use in searching for radiation sources. The instrument was constructed to verify that weak point sources can be detected at considerable distances if one uses imaging to overcome fluctuations in the natural background. The instrument uses a rank-19, one-dimensional coded aperture to cast shadow patterns onto a 0.57 m2 NaI(Tl) detector composed of 57 individual cubes each 10 cm on a side. These are arranged in a 19 x 3 array. The mask is composed of four-centimeter thick, onemeter high, 10-cm wide lead blocks. The instrument is mounted in the back of a small truck from which images are obtained as one drives through a region. Results of first measurements obtained with the system are presented.
Keywords	Radiation detectors Gamma rays Remote sensing Coded aperture imaging
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603