title: The properties of gamma-radiation and high-energy neutron fluxes in "MIR" station orbit.
abstract: The study of radiation background components in the near-Earth space is very important for different branches of space research, in particular for space dosimetry and for the planning of gamma-astronomy experiments. Detailed information on the neutral components (gamma-quanta, neutrons) of background radiation was obtained during the Grif-1 experiment onboard Mir orbital station (OS). The measurements of fluxes of 0.05-50 MeV gamma-quanta and >30 MeV neutrons with a large area instrument (approximately 250 cm2 for gamma-quanta, approximately 30 cm2 for neutrons) as well as corresponding charged particle measurements (0.4-1.5 MeV electrons, 1-200 MeV protons) were made during this experiment. The background components induced by the station's own radiation as well as the albedo gamma-rays from the Earth's atmosphere were revealed as the result of data analysis for about 600 h of observation. A mathematical model describing the latitude and energy dependences of atmospheric albedo gamma-rays as well as of those of gamma-quanta produced in the material of the station due to cosmic ray interactions was developed. An analytical approximation of the spectrum of induced gamma-rays from radioactive isotopes stored in the station and instrument's materials is presented. The dynamics of gamma-quantum background fluxes during the geomagnetic disturbances of January 10-11, 1997 are discussed. An analytical representation of the latitude dependence of the integral flux of neutrons with >30 MeV is given.
authors.affiliation: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Bogomolov
authors.forename: V V
authors.initials: VV
authors.lastname: Bogomolov
authors.forename: Yu I
authors.initials: YI
authors.lastname: Denisov
authors.forename: Yu I
authors.initials: YI
authors.lastname: Logachev
authors.forename: S I
authors.initials: SI
authors.lastname: Svertilov
authors.forename: M I
authors.initials: MI
authors.lastname: Kudryavtsev
authors.forename: V I
authors.initials: VI
authors.lastname: Lyagushin
authors.forename: T V
authors.initials: TV
authors.lastname: Ershova
mesh_terms: D001938:Brazil; D003359:Cosmic Radiation; D004583:Electrons; D019471:Elementary Particle Interactions; D005118:Extraterrestrial Environment; D005720:Gamma Rays; D009502:Neutrons; D011522:Protons; D011834:Radiation Monitoring / Q000295:instrumentation*; D013026:Space Flight / Q000295:instrumentation*; D018531:Spacecraft / Q000295:instrumentation
chemical_list: D011522:Protons