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Radioisotopes are incorporated into fish otoliths in exactly the same way as are stable isotopes of any given element.

Once incorporated into the otolith, the radioisotopes decay into radioactive daughter products, which are themselves retained within the acellular crystalline structure.

radioactive isotopeor radioisotope,natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reached...... Radiochemistry, because of the topics, methods, and objects of its investigations, can be subdivided into general radio-chemistry, the chemistry of nuclear transformations, the chemistry of radioactive elements, and applied radiochemistry.

When based on analysis of the extracted core, the radiochemical approach appears to be both objective and accurate in the estimation of fish age.

Nevertheless, the isotopic concentrations requiring measurement are exceedingly low, resulting in assay precisions which are often less than optimal.

Radioisotope ratios in whole otoliths can be interpreted if some rather problematic assumptions can be met.

However, the extracted otolith core reflects elapsed time since core formation, which in turn is very similar to the age of the fish.

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