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information on radioisotopes please??

what happens when the isotope reaches stability?? and how does the way the isotope travel help gamma cameras produce an image telling us where the cancer may be? any more info will be much appreciated, like how they work and stuff, im really stuck on this so thanks for any help :D
 ninjasrawesome posted over a year ago
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blackpanther666 said:
Generally, radioactive isotopes have lost their radio-activity when they reach stability, that is, if they do reach stability. The radioactive properties of the chemical contribute to the workings of the gamma cameras, which detect levels of energy/high chemical activity in the body. If you want more info, I suggest you read Campbell and Reece biology textbooks... They are excellent.
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