Interactive radiation portal - radiaverse.com
Main emission lines: 511keV
The earth's atmosphere shields us from solar wind particles, but if we go higher (e.g., flying in an airplane), this shielding will weaken and the spectrum will show a significant rise in the high-energy region. An annihilation peak at 511 keV may be observed. Also such a spectrum can indicate the presence of neutron radiation, in which case the instrument will record the energy of the recoil nuclei.
