radioactive material
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material that is radioactive
radioactive material meaning & definition 1 of radioactive material.
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Radioactive material refers to any substance or material that spontaneously emits ionizing radiation, such as alpha, beta, or gamma rays, due to the instability of its atomic nucleus. This decay process can potentially cause harm to living organisms. The material can be a natural element from the periodic table, a product of a man-made nuclear reaction, or even a combination of both.
radioactive material meaning & definition 2 of radioactive material.