Development of the imaging system of the balloon-borne gamma-ray telescope Máscara Codificada (MASCO)

Details Development of the imaging system of the balloon-borne gamma-ray telescope Máscara Codificada (MASCO) Development of the imaging system of the balloon-borne gamma-ray telescope Máscara Codificada (MASCO)

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rsci...73.3619b&link_type=abstract

Review of Scientific Instruments, Volume 73, Issue 10, pp. 3619-3628 (2002).

Computer Science

X- And Gamma-Ray Instruments

Scientific paper

We report laboratory imaging results of a balloon-borne gamma-ray imaging telescope, Máscara Codificada (Portuguese for ``coded mask,'') designed to obtain high angular resolution (~14 arcmin) images of the sky in the 50 keV-1.8 MeV energy range. The instrument incorporates a coded mask with an aperture pattern based on a 19×19-element modified uniformly redundant array (MURA). This pattern belongs to a subclass of MURAs that are almost completely antisymmetrical for 90° rotations with respect to the lower-right corner of the central element, which allows the implementation of an antimask by a single rotation of the whole mask by 90°. The symmetry properties of the MURAs are discussed. The algorithm for determining the position of the gamma-ray interactions on the instrument's main detector is described and the results of laboratory tests of the imaging system are presented. The mask-antimask subtraction, applied after a flat-fielding procedure, produced a 60% increase in the signal-to-noise ratio of a strong (~100σ) point source (662 keV photons coming from a 137Cs radioactive source) image by eliminating systematic distortions in the instrumental background measured over the detector plane.

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