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Both. Radioisotopes decay because they are atomically unstable. This can be used to advantage in medical treatment or diagnosis and in other forms of research or inspection. But radioactive decay releases ionizing radiation, and that is invariably harmful to living tissue. The problem presents as one of weighing the cost-benefit ratio of a given application. As just one example, radiation kills tissue, but it kills cancerous tissue much more readily than "regular" tissue. This makes radiation tratment by radioisotopes beneficial in cases where other options are limited.

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16y ago

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