Gamma-ray spectroscopy is a scientific technique used to study the energy levels and transitions of atomic nuclei by analyzing the gamma rays emitted when these transitions occur. This technique is commonly used in nuclear physics, nuclear chemistry, and other fields to investigate the structure and properties of atomic nuclei, as well as to identify and quantify radioactive isotopes in a sample. By measuring the energy and intensity of gamma rays emitted by a sample, researchers can gain valuable information about its composition, radioactive decay, and other nuclear processes. Gamma-ray spectroscopy is a powerful tool in many areas of research, including environmental monitoring, medical imaging, and nuclear security.