Canadian Light Source Inc. announces first shipment of medical isotopes

And should you want to know more about Tc-99m, check out the wikipedia article

The MIP uses a particle accelerator to bombard a target made of enriched molybdenum-100 metal (Mo-100) with high-energy X-rays. The X-rays knock a neutron out of the nuclei of some of the Mo-100 atoms in the target, converting them to the isotope Mo-99. The Mo-99 decays into technetium-99m (Tc-99m), which is used for tagging radiopharmaceuticals for medical diagnostic tests. After the Mo-99 has decayed, the remaining Mo-100 in the solution is recovered and recycled into additional targets