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natural radioactivity |
Also found in: Medical, Wikipedia | 0.06 sec. |
natural radioactivityRadioactivity generated by those radioactive elements that exist in the Earth's crust. All the elements from polonium (atomic number 84) to uranium (atomic number 92) are radioactive. Radioisotopes of some lighter elements are also found in nature (for example potassium-40). See background radiation. |
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