Determination of angular resolution of coded aperture gamma-ray telescope

Details Determination of angular resolution of coded aperture gamma-ray telescope Determination of angular resolution of coded aperture gamma-ray telescope

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpspr...1...49k&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-85-001) p 49 (SEE N85-22403 13-12) Transl. into ENGLISH from Kosmicheskiye Issled. (USSR),

Astronomy and Astrophysics

Astronomy

Angular Resolution, Apertures, Calibrating, Coding, Gamma Ray Telescopes, Astronomy, Bremsstrahlung, Fourier Transformation, Sizing Screens

Scientific paper

While the angular resolution of the best modern gamma-ray telescopes using spark chambers is about 2 deg for gamma quanta energies in the 100 MeV range, aperture coding by inserting a coding screen in front of the detector can increase the resolution to 1' to 10' while cutting the effective aperture of the telescope in half. An experiment is described that uses a beam of tagged gamma quanta from the Pakhra accelerator to calibrate second generation gamma-ray telescopes. A one-dimensional coding screen with 19 elements (10 transparent teflon elements and 9 lead absorbing elements) was used. The screen was 15 mm thick. It is shown that high energy gamma ray telescopes using this technique can achieve an angular resolution of a few minutes. This is demonstrated here for a gamma quanta energy of 100 MeV and for the bremsstrahlung spectrum of gamma radiation corresponding to cosmic gamma radiation sources. A low frequency filtering technique employing a discrete Fourier transform was used on the resulting images and is briefly described.

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