2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201014A measurement of the cosmic ray positron fraction e+/(e+ + e-) in the energy range of 1-30 GeV is presented. The measurement is based on data taken by the AMS-01 experiment during its 10 day Space Shuttle flight in June 1998. A proton background suppression on the order of 10^6 is reached by identifying converted bremsstrahlung photons emitted from positrons.20 pages, Latex, 7 .eps figuresAstrophysicstext