what are radioactive materials used for
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what are radioactive materials used for, radioactive materials used in medicine, what are radioactive materials, uses of radioactive substances, uses of radioactive elements, devices containing radioactive material, examples of radioactive materials, list of radioactive materials, types of radioactive materials, what is radioactive material called, what metal is used to store radioactive, what are the uses of radioactivity, metal used to store radioactive sources, definition of radioactive material, machinery containing in radioactive material, nuclear material and radioactive material