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  • 1
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    Operating characteristics of a prototype high energy gamma-ray telescope (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The field of gamma-ray astronomy in the energy range from ten to several hundred MeV is severely limited by the angular resolution that can be achieved by present instruments. The identification of some of the point sources found by the COS-B mission and the resolution of detailed structure existing in those sources may depend on the development of a new class of instrument. The coded aperture mask telescope, used successfully at X-ray energies hold the promise of being such an instrument. A prototype coded aperture telescope was operated in a tagged photon beam ranging in energy from 23 to 123 MeV. The purpose of the experiment was to demonstrate the feasibility of operating a coded aperture mask telescope in this energy region. Some preliminary results and conclusions drawn from some of the data resulting from this experiment are presented.
    Keywords: SPACE RADIATION
    Type: OG-9.2-7 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 318-321; NASA-CP-2376-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Modeling a high energy gamma-ray telescope (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Monte Carlo program was developed to simulate a high energy gamma-ray telescope using a coded aperture mask (CAMTRAC). The ultimate purpose of the calculation will be to determine the optimum design parameters for such an instrument. The model can also used to ascertain under what conditions CAMTRAC performance is superior to that of conventional telescopes which employ electron-positron pair direction as the sole means of determining gamma ray direction.
    Keywords: SPACE RADIATION
    Type: OG-9.2-5 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 311-313; NASA-CP-2376-VOL-3
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Secondary gamma-ray production in a coded aperture mask (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The application of the coded aperture mask to high energy gamma-ray astronomy will provide the capability of locating a cosmic gamma-ray point source with a precision of a few arc-minutes above 20 MeV. Recent tests using a mask in conjunction with drift chamber detectors have shown that the expected point spread function is achieved over an acceptance cone of 25 deg. A telescope employing this technique differs from a conventional telescope only in that the presence of the mask modifies the radiation field in the vicinity of the detection plane. In addition to reducing the primary photon flux incident on the detector by absorption in the mask elements, the mask will also be a secondary radiator of gamma-rays. The various background components in a CAMTRAC (Coded Aperture Mask Track Chamber) telescope are considered. Monte-Carlo calculations are compared with recent measurements obtained using a prototype instrument in a tagged photon beam line.
    Keywords: SPACE RADIATION
    Type: OG-9.2-6 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 314-317; NASA-CP-2376-VOL-3
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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