A Mura-based mask telescope

Details A Mura-based mask telescope A Mura-based mask telescope

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...95v&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)95-(5)98

Physics

Optics

5

Apertures, Arrays, Astronomical Observatories, Gamma Ray Astronomy, Gamma Ray Telescopes, Masks, X Ray Astronomy, Angular Resolution, Crystal Optics, Photomultiplier Tubes, Photosensitivity, Redundant Components, Scintillation Counters, Sodium Iodides

Scientific paper

A high-energy telescope that employs a Modified Uniformly Redundant Array (MURA) coded mask is described. The imaging device is a 19x19 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 min over a 13 deg field of view. The expected 3 sigma sensitivity for an on-axis source observed for 104s at a residual atmosphere of 3.5g/sq cm is 1.5 x 10-5 photons/sq cm/s/keV at 100 keV and 1.0 x 10-6 photons/sq cm/s/keV at 1 MeV.

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