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  • INSTRUMENTATION AND PHOTOGRAPHY  (5)
  • 1
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    Energy resolution enhancement of mercuric iodide detectors (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A pulse processing technique has been developed which improves the gamma-ray energy resolution of mercuric iodide detectors. The technique employs a fast (100 ns) and a slow (6.4 microsec) pulse height analysis to correct for signal variations due to variations in charge trapping. The capabilities of the technique for energy resolution enhancement are discussed as well as the utility of the technique for examining the trapping characteristics of individual detectors. An energy resolution of 2.6 percent FWHM at 662 keV was achieved with an acceptance efficiency of 100 percent from a mercuric iodide detector which gives 8.3 percent FWHM using standard techniques.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-31; 348-352
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Hexagonal uniformly redundant arrays for coded-aperture imaging (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Uniformly redundant arrays are used in coded-aperture imaging, a technique for forming images without mirrors or lenses. This technique is especially important for the high energy X-ray and gamma-ray region above 20 kev. In this technique, a mask consisting of opaque (closed) and trasparent (open) areas is placed between the photon sources to be imaged and a position sensitive detector or a detector array. Each source casts a shadow pattern of the mask or aperture onto the detector. This shadow pattern may be viewed as an encoded signal for that source direction. If each possible source code is unique, the detected composite of overlapping shadow patterns may be decoded to produce an image of the source distribution.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: OG-9.2-1 , Contrib. to the 19th Intern. Cosmic Ray Conf.; 4 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A thick Anger camera for gamma-ray astronomy (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The NaI(Tl) Anger camera is a natural candidate for a position sensitive detector in imaging of astrophysical gamma-ray sources. Here laboratory measurements are presented of the response of a relatively thick (5.1 cm) NaI(Tl) Anger camera designed for coded aperture imaging in the 50 keV to 2 MeV energy range. A position resolution of 10.5 mm FWHM at 122 keV and 6.3 mm FWHM at 662 keV. The energy resolution was 7 percent FWHM at 662 keV. The ability of the detector to resolve the depth of the gamma-ray interaction and the use of this depth resolution to reduce back-incident and internal background is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-32; 129-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The generation of transition radiation by relativistic particles in plastic foam radiators (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The design of large area transition radiation detectors for highly relativistic particles can be greatly simplified if plastic foam radiators are employed. Using electron beams with energies 1-9 GeV at the Cornell synchrotron, we have studied the properties of a large variety of transition radiators consisting of commercially available foam materials. In most cases, a measurable transition radiation signal has been observed, but only a few materials have been found to be suitable for practical purposes. The observed radiation yield is in these cases very similar to that of equivalent multifoil radiators. A detailed discussion is given of the particle detection efficiency that can be obtained with high yield foam radiators.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nuclear Instruments and Methods; 123; 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Gamma-ray imaging with a rotating hexagonal uniformly redundant array (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Laboratory experiments have been performed to demonstrate the capabilities of a gamma-ray imaging system employing a NaI Anger camera and a rotating coded aperture mask. The mask incorporates in its design a new type of hexagonal uniformly redundant array (HURA) which is essentially antisymmetric under 60 deg rotation. The image formation techniques are described and results are presented that demonstrate the imaging capability of the system for individual and multiple point sources of gamma-ray emission. The results are compared to analytical predictions for the imaging and point source localization capabilities of coded aperture systems using continuous detectors.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-31; 771-775
    Format: text
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    NASA TECHNICAL REPORTS
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