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  • Other Sources  (2)
  • NASA Technical Reports  (2)
  • SPACE RADIATION  (2)
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  • Other Sources  (2)
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  • NASA Technical Reports  (2)
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  • 1
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    Unknown
    Observation of hard X-rays from the Crab pulsar and A0535+26 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Crab pulsar PSR0531+21 was observed in a balloon flight from the Xianghe Balloon Station (China). Data were obtained in the range 20 to 200 keV with a poswish hard X-ray telescope which comprised a 150 sq cm primary crystal of 5 mm thick CsI(T1) which actively shielded the lower 2 pi steradians by a 5 cm thick NaI(T1) crystal. The scintillation pulses originating in CsI and NaI crystals are distinguished by pulse shape discrimination. The telescope has a field of view of approximately 4 deg H psi H pi determined by graded shield and collimator. The effective geometric area of the detector is 116 sq cm. It is noted that when folding a data flow on a long period interference from the data acquisition, transmission and recording system considerably affect the result.
    Keywords: SPACE RADIATION
    Type: OG-2.3-7 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 149-150; NASA-CP-2376-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An approach of reducing the background induced by neutrons (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The background induced by interactions of neutrons with detector material (and shield material) is difficult to be rejected. It is one of the most important factors to affect the sensitivity of a balloon-borne gamma-ray astronomical telescope. The main component of neutron flux at the major detector of the telescope is incident neutrons, that consists of atmospheric neutrons and neutrons locally produced in the balloon platform. Therefore, shielding the detector from incident neutrons is a possible way to reduce the background. NaI (T1) crystal is very widely used in gamma-ray astronomical telescopes. Through balloon-borne experiment it is shown that up 6 LiF shield is effective to reduce the background in NaI crystal.
    Keywords: SPACE RADIATION
    Type: OG-9.3-5 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 371-374; NASA-CP-2376-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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