cosmic ray highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds
ionizing radiation -
High-energy radiation that is capable of causing ionization in substances through which it passes; also includes high-energy particles.
OmegaWiki Dictionary
Ω
ionizing radiation Radiation that is capable of energizing atoms sufficiently to remove electrons from them.