Which of the following is a commonly used gamma-emitting radionuclide?

Iodine-125 is a commonly used gamma-emitting radionuclide, widely recognized for its applications in various fields such as medicine and research. This radionuclide emits gamma radiation, which makes it particularly useful in diagnostic imaging and therapeutic procedures, especially in the treatment of certain cancers. The gamma emissions can be detected with appropriate imaging equipment, allowing clinicians to visualize and monitor the distribution of the radionuclide within the body or in a sample.

In the context of radiation safety and training, understanding the properties and applications of gamma-emitting radionuclides like Iodine-125 is crucial for safe handling and effective use in medical and research settings. This knowledge helps in developing appropriate safety protocols and ensuring proper monitoring of radiation exposure.

The other radionuclides listed have different emission characteristics or primary uses. For example, Carbon-14 primarily emits beta particles and is widely used in radiocarbon dating rather than in gamma applications. Radon-222, while a radioactive gas, is often associated with alpha emission rather than gamma, and Uranium-238 is primarily known for emitting alpha particles with some associated gamma radiation but is not utilized as a common gamma-emitting radionuclide in practice. Thus, Iodine-125 stands out for its