Final answer:
Technetium-99m (99mTc) is typically used in Positron Emission Tomography (PET) scans to image the physiological functioning of various body organs, leveraging its short half-life for patient safety.
Step-by-step explanation:
Technetium-99m (99mTc) is a radioisotope that is widely used in medical diagnostic procedures. Specifically, 99mTc is commonly utilized in Positron Emission Tomography (PET) scans, which are used for imaging active blood flow and physiological activities of the organs. This radiation is short-lived, which makes it relatively safe and limits the radiation dose to the patient due to its short 6.0-hour half-life. 99mTc provides valuable information for the medical assessment of various organs such as the skeleton, heart, lungs, and kidneys, and is particularly useful for looking at cardiac function and blood flow in the brain.