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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/066/06/0353-0359

    • Keywords

       

      Pulse Height; Pulse Height Spectrum; Isotropic Background; Thermal Radiation Spectrum; Balloon Altitude

    • Abstract

       

      The observations of omnidirectional X-ray flux at the top of the atmosphere have been extended upto 200 KeV using a balloon-borne NaI (Tl) scintillator detector at Hyderabad, India. The omnidirectional flux at 60 KeV is found to be 0·0066±0·0014 photons/cm.2 sec. ster. KeV. The X-ray flux in the energy range 50–290 KeV can be adequately represented by the spectrum Ke−2.2±0.4. New upper limits to the hard X-ray flux from the quiet sun have also been obtained from the same measurement.

    • Author Affiliations

       

      U R Rao1 E V Chitnis1 A S Prakasarao1

      1. Physical Research Laboratory, Ahmedabad, India
    • Dates

       
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