The favorable nuclear properties in combination with the rich coordination chemistry make technetium-99m the radioisotope of choice for the development of myocardial perfusion tracers. In the early 1980s. [99mTc]Tc-Sestamibi. [99mTc]Tc-Tetrofosmin. https://www.roneverhart.com/Bob-The-Boxcutter-R1P-Aluminum-Grey/