The primary use of isotopes in scientific research lies in their ability to trace and quantify processes. In fields such as geology, biochemistry, and medicine, isotopes can help determine age, track chemical pathways, and analyze metabolic rates. For instance, radioactive isotopes are used in radiocarbon dating to estimate the age of organic materials, while stable isotopes can provide insights into ecological and physiological processes. This technique enhances our understanding of various phenomena, contributing valuable data for both basic and applied research.