Abstract
A high-energy telescope that employs a Modified Uniformly Redundant Array (MURA) coded mask is described. The imaging device is a 19×19 element square MURA-based extended mask mounted in a single mask-antimask configuration. This is the first experiment to use such a mask pattern and configuration for astrophysical purposes. The detector system consists of a 41 cm diameter, 5 cm thick NaI(Tl) crystal coupled to 19 photomultipliers. The anticoincidence system is composed of plastic scintillators on the sides and a NaI(Tl) crystal at the bottom. The angular resolution is approximately 14′ over a 13° field of view. The expected 3 σ sensitivity for an on-axis source observed for 10 4 s at a residual atmosphere of 3.5 g.cm −2 is 1.4 × 10 −5 photons cm −2 s −1 keV −1 at 100 keV and 1.0 × 10 −6 photons cm −2 s −1 keV −1 at 1 MeV.
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