title: Neutron fluences and energy spectra in the Cosmos-2044 biosatellite orbit.
abstract: Joint Soviet-American measurements of the neutron component of space radiation (SR) were carried out during the flight of the Soviet biosatellite Cosmos-2044.  Neutron flux densities and differential energy spectra were measured inside and on the external surface of the spacecraft.  Three energy intervals were employed:  thermal (En < or = 0.2 eV), resonance (0.2 eV < En < 1.0 MeV) and fast (En > or = 1.0 MeV) neutrons.  The first two groups were measured with U.S. 6LiF detectors, while fast neutrons were recorded both by U.S. fission foils and Soviet nuclear emulsions.  Estimations were made of the contributions to absorbed and equivalent doses from each neutron energy interval and a correlation was presented between fast neutron fluxes, measured outside the satellite, and the phase of solar activity (SA).  Average dose equivalent rates of 0.018 and 0.14 mrem d-1 were measured for thermal and resonance neutrons, respectively, outside the spacecraft.  The corresponding values for fast neutrons were 3.3 (U.S.) and 1.8 (U.S.S.R.) mrem d-1.  Inside the spacecraft, a value of 3.5 mrem d-1 was found.
authors.affiliation: Research Center of Spacecraft Radiation Safety, Ministry of Health, Moscow, U.S.S.R.
authors.forename: V E
authors.initials: VE
authors.lastname: Dudkin
authors.lastname: Potapov YuV
authors.forename: A B
authors.initials: AB
authors.lastname: Akopova
authors.forename: L V
authors.initials: LV
authors.lastname: Melkumyan
authors.lastname: Rshtuni ShB
authors.forename: E V
authors.initials: EV
authors.lastname: Benton
authors.forename: A L
authors.initials: AL
authors.lastname: Frank
mesh_terms: D003359:Cosmic Radiation; D005373:Film Dosimetry / Q000706:statistics & numerical data*; D007391:International Cooperation; D009502:Neutrons / Q000145:classification*; D016082:Solar System; D013026:Space Flight / Q000295:instrumentation*; D018531:Spacecraft; D014586:USSR; D014481:United States