An "ion" is an atom or group of atoms that has an electric charge. Ions with a positive charge are called cations. Ions with a negative charge are called anions. Ions can be created using radiation (X-rays, radium, radioisotopes). Ionizing radiation is often used for diagnostic or therapeutic procedures. The ions may be nonradioactive and can be used to scan for disease or other abnormalities. Related topics:

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