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A general public knowledge base dedicated to radioactivity created and maintained by the french physics community

Radioelements (or radioisotopes or radionuclei or radionuclides) are atoms whose nuclei are radioactive. For example, iodine-131 and caesium-137, produced in reactors, are radionuclei that have the same physical and chemical properties that the non radioactive atoms of iodine and caesium found in Nature.
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