There are other isotopes, but they use different cameras. For example, for the SPECT cameras or gamma cameras, which use the technetium, the alternative is thallium, which can use the same camera for cardiac scanning. You can also use iodine-123 to image kidneys. It has a half life of 13 hours, so again timing is critical. We have gallium-67, which is used for the detection of Hodgkin's disease and lymphomas, among other types of cancers.
Using PET scanners.... This country doesn't have as many PET scanners as we have SPECT cameras, because nuclear medicine is state-of-the-art, the best there is to treat some of these things. But there is fluoride or FDG, which can be used for bone scanning for cancer, which is now made available through the clinical trials, and we know hospitals in Quebec are going to be using this. We have rubidium-82, which is used in some small heart conditions as well. We also have MRIs and CT scans that can be used.
Again, this is for contingency planning, not for ongoing management. But they are alternatives that the medical community and the provinces and territories have identified in their contingency planning.