Gamma, Sterilising food, Killing cancer, Very penetrating, low ionization, Main component of cosmic rays, High energy electromagnetic radiation, No mass or charge, Alpha, Contains 2 neutrons and 2 protons, Very ionizing but low penetration, Smoke detectors, Present in radon gas a major contributor to background radiation, Dangerous if ingested, Beta, Fast-moving electron, Medium ionization and penetration, Controls paper and metal thickness, Used in internal radiotherapy, Anti-particle is positron

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