no carrier added 

https://doi.org/10.1351/goldbook.N04174
A preparation of a radioactive isotope which is essentially free from stable isotopes of the element in question.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2522 [Terms] [Paper]
Citation: 'no carrier added' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.N04174 RIS BibTex EndNote
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Last revised: February 24, 2014