Common isotopes for radiometric dating

Radioactive isotopes are effective tracers because their radioactivity is easy to detect.A is a substance that can be used to follow the pathway of that substance through some structure.

However, therapeutic applications usually require much larger doses because their purpose is to preferentially kill diseased tissues.The half-life of radioactive isotopes is unaffected by any environmental factors, so the isotope acts like an internal clock.For example, if a rock is analyzed and is found to contain a certain amount of uranium-235 and a certain amount of its daughter isotope, we can conclude that a certain fraction of the original uranium-235 has radioactively decayed.Radioactive isotopes have a variety of applications.Generally, however, they are useful because either we can detect their radioactivity or we can use the energy they release.

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