Artificial radioactivity induced in detector shields by protons of the inner radiation belt

Computer Science

Scientific paper

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Cosmic Rays, Inner Radiation Belt, Proton Belts, Radiation Detectors, Radioactivity, Satellite-Borne Instruments, Cosmos Satellites, Gamma Rays, Instrument Errors, Polar Caps, Radiation Shielding, Radioactive Decay

Scientific paper

Cosmic ray measurements at the equator and the polar caps at heights between 400 and 2000 km revealed a higher count rate of a shielded gas-discharge counter as compared to a counter with a less effective shielding. The higher count rate resulted from the activation of the shield by radiation-belt protons, the response of the instrument being affected by the asymmetry of the belt with respect to the center of the earth. The half-decay constant of the isotope produced is determined. The fact that a higher count rate was observed at the polar caps even in the absence of irradiation is attributed to the possible presence of high-energy albedo gamma-quanta.

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