27 November 1989 The Gamma Ray Arcminute Telescope Imaging System (GRATIS) Detector Performance And Imaging
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Abstract
We are constructing a telescope with arcminute resolution in the soft 7-ray band. This telescope will provide the first images of cosmic sources on arcminute scales in the energy range 30 - 200 keV. Arcminute resolution gives us the capability, for the first time, to image truly diffuse emission in this wavelength band, opening up exciting new scientific opportunities. The payload consists of ~36 independent coaligned modules. Each module consists of an alkali halide scintillating crystal collimated to a one dimensional coded aperture mask. Every module is fixed in the telescope with a different rotational orientation, allowing reconstruction of two dimensional images. For our application this novel approach has several advantages over a standard two dimensional coded aperture implementation. We have simulated this system and demonstrated the fidelity and robustness of the reconstructions. In addition, we have refined the GRATIS detector technology and achieved improved spatial resolution over that previously reported.
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Fiona A. Harrison, Fiona A. Harrison, Steven M. Kahn, Steven M. Kahn, Charles J. Halley, Charles J. Halley, Klaus P. Ziock, Klaus P. Ziock, Philip M. Lubin, Philip M. Lubin, Michael Seiffert, Michael Seiffert, K. O.H. Ziock, K. O.H. Ziock, } "The Gamma Ray Arcminute Telescope Imaging System (GRATIS) Detector Performance And Imaging", Proc. SPIE 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics, (27 November 1989); doi: 10.1117/12.962563; https://doi.org/10.1117/12.962563
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