Which isotopes are commonly used in routine quality control checks?

The correct answer highlights Technetium-99m and Cesium-137, both of which play critical roles in routine quality control checks within the realm of medical imaging and radiation safety.

Technetium-99m is predominantly used in nuclear medicine due to its ideal physical properties, such as its suitable half-life and low-energy gamma emissions. These characteristics make it an excellent choice for various imaging procedures, allowing for effective quality control assessments of imaging equipment and the reliability of procedures.

Cesium-137, on the other hand, is primarily used in calibration and checking the performance of radiation measurement devices. Its gamma radiation emissions help ensure that detectors are functioning correctly and can accurately measure radiation exposure.

In contrast, the other isotopes listed are less commonly associated with routine quality control checks in medical settings. For instance, Uranium-238 and Carbon-14 are generally not used for such purposes; their applications are more focused on geological dating and environmental studies. Radium-226 and Iodine-131, while having medical applications, are not standard isotopes for routine quality control processes. Thallium-201 and Fluorine-18 have specific clinical uses but do not serve the same widespread quality control functions as Technetium-99m and Ces