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    Tracers can be used to detect leaks in underground water pipes; also they can be used to follow steps of a complex chemical reaction.A good example of uses of radioisotopes in biology is using the carbon-14 isotopes in determining the steps in the process of photosynthesis in plants.

    The data also show that clasts with complex exposure histories are pervasive and that clast recycling is highly site-dependent.Long-lived radioactive elements such as uranium, thorium and potassium and any of their decay products, such as radium and radon are examples of NORM.These elements have always been present in the Earth's crust and atmosphere, and are concentrated in some places, such as uranium orebodies which may be mined.Radioactive isotopes have a variety of applications as they are useful as the radioactivity of these isotopes can be detected or the energy released by them can be used.Radioisotopes are effective traces as their radioactivity is easy to detect.

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