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THE PROBLEM OF BACKGROUND RADIATION
LOW ENERGY GAMMA RAY TELESCOPES
7 other sections not shown
active shield air shower American Astronomical Society angle angular resolution annihilation anticoincidence Astrophys attenuation background radiation balloon bremsstrahlung bursts calculated Cerenkov charged particles collisions Compton scattering Compton telescope COS-B cosmic ray cosmic ray particles counting rate cross-section decay density detected direction of motion distance electromagnetic energy gamma rays energy spectrum frequency Galactic centre Galactic disc gamma ray astronomy gamma ray emission gamma ray flux gamma ray lines gamma ray telescope given high energy gamma hydrogen intensity interaction interstellar isotropic low energy gamma magnetic field measurements multiple scattering neutral pions nuclear nuclei nucleons observed optical pair production photon energies photons pions positrons power law primary photon produced pulsars radio emission radioactive Ramaty recorded region relativistic electrons satellite scattered photon scintillation counter secondary electrons Seyfert galaxies shown in Fig sodium iodide solar flares spark chamber spark chamber telescope spectra Stecker supernova synchrotron radiation velocity X-ray