The Cosmos-782 and Prognoz-4 studies of cosmic radiation LET spectra.

The data on the cosmic radiation LET spectra at different distances from the Earth (inside and outside the magnetosphere) indicate that there is a considerable screening effect of the geomagnetic field with respect to the galactic cosmic radiation. The screening coefficient, including the screening effect of the Earth itself, is about 7 for the absorbed dose and about 26 for the dose equivalent. The galactic cosmic radiation accumulated dose equivalent outside the Earth's magnetosphere and behind a shield thickness of 1 g/cm2 is about 95 rem per year near the solar minimum. LET spectrum data for different altitudes in the near-Earth region of space can be used in the manned space flight radiation protection for spacecraft shielding calculations and for the development of dosimetric control instruments, as well as in the planning and data interpretation of radiobiological experiments in space.