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Gamma ray is a type of radiation that has no mass & no charge. Gamma rays have a high penetrating power. Text us. Tags: gamma ray, radiation, mass. Wednesday, February 01 2012.
There are other forms of radiation from nuclear decay that  are not ionizing, such as neutrinos and low energy photons, and  other sources for ionizing radiation, such as cosmic rays.    Ionizing radiation comes in two basic forms, particles and waves.