Gamma radiation is high-energy photons. Which type of radiation does this describe?

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Gamma radiation consists of high-energy photons, the quanta of electromagnetic radiation. Photons have no mass and no electric charge, and gamma rays represent the most energetic form of electromagnetic radiation produced in nuclear processes. This differentiates them from neutrons (massive, neutral particles), electrons (charged particles with mass), and protons (charged particles with mass). Therefore, describing gamma radiation as high-energy photons is the correct fit.