Are Radioisotopes and Radionuclides the Same Thing?

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SUMMARY

Radioisotopes and radionuclides are terms that are often used interchangeably, but they have distinct meanings in the context of nuclear chemistry. A radioisotope refers specifically to an unstable isotope of a chemical element, while a radionuclide encompasses any nuclide that is radioactive, including stable isotopes. The distinction lies in the relationship between the two atoms, where radioisotopes share similar chemical properties due to having the same atomic number. Sources such as Wikipedia and the NRC confirm this differentiation.

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oksuz_
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Hi,

Is there any difference between a radioisotope and a radionuclide? I checked some sources on the internet and figured out that they can be used interchangeably. Is this so? If so, why are there two different words for the same thing?

Thank you.
 
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Wikipedia treats them interchangeably, both as an unstable atom. The term "isotope", a variant of a chemical element, denotes a relationship between two nuclei types. Two atoms are isotopes of one another if they have the same atomic number, i.e. the same number of protons in the nucleus. Thus "radioisotope" and "radionuclide" have slightly different meanings, since "radioisotope" makes reference to the relationship between two atoms that have similar chemical properties.
 

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