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0.28-Mev radiation 17-Mev radiation absorption coefficient absorption thickness alumi aluminum resonance amplifier annihilation radiation average energy bombarded by protons bombardment current circuit coincidence counts coincidence yield control grid counting rate dry cells ELECTRONIC MANOMETER SYSTEM electroscope energy of gamma-rays excitation curve filament film thickness fluorine contamination fluorine resonance galvanometer gamma gamma-ray energy gamma-ray yield GAMMA-RAYS EMITTED GAMMA-RAYS FROM ALUMINUM Gentner half-value thickness half-widths hard component investigated IONIZATION GUAGE lead absorption curve lithium radiation lithium target low voltage region measurements observed obtained pentode percent Phys plate positive ions positron pressure probable error proton beam proton bombardment proton energies protons on thin R. G. Herb radiation emitted radiation from N13 relative heights resistor reso resonance peaks resonance structure screen grid secondary electrons sensitive shown in Fig single counts singles yield soft radiation tantalum thick aluminum target thick target thin films tion University of Wisconsin volts yield curve