"碳同位素年龄测定" can be translated as "carbon isotope dating" or "carbon isotopic age determination".
"Carbon isotope dating" is a more concise and commonly used term in scientific contexts, especially when referring to the general method of determining the age of materials using carbon isotopes (such as carbon-14 dating).
"Carbon isotopic age determination" provides a slightly more detailed description, emphasizing the process of determining age through isotopic analysis.
Both expressions are accurate, and the choice between them may depend on the specific context or level of detail required.