ON THE FEASIBILITY OF STUDYING THE FLUXES OF PROTONS AND HELIUM-ISOTOPES WITH NUCLEAR PHOTOEMULSION AGAINST THE BACKGROUND OF RADIATION BELT PARTICLES

Differential 6-20 MeV/nucleon energy proton and helium energy spectra were measured at a similar to 200 km altitude in the space near the Ea rth during solar minimum in 1987. The particles were detected using a photoemulsion which was then treated with a discriminator-developer to discriminate the proton and helium tracks against the background of i ntensive fluxes of low-ionizing relativistic particles and the photogr aphic fog accumulated in the emulsion during its exposure in the space . This technique has permitted helium isotopes to be distinguished in the particle flux detected.