What energy does Thallium-201 (Tl-201) emit?

Thallium-201 (Tl-201) primarily emits gamma rays of 81 keV, which is significant in nuclear medicine, particularly in myocardial perfusion imaging. This energy level is well-suited for imaging because it allows for good penetration through body tissues while producing a clear signal that can be detected by gamma cameras. The emission of gamma rays at this energy facilitates detailed imaging of cardiovascular conditions, aiding physicians in diagnosing and assessing heart function and blood flow.

Other gamma emissions associated with Thallium-201 do occur, but the most prominent and clinically relevant one is indeed the 81 keV photon. This energy level falls within the optimal range for gamma camera detection, making it valuable for various diagnostic procedures.