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The reading on the detector increases when above a leak as the radiation can escape through the hole in the pipe more easily and also there will be an accumulation of the radioactive fluid in the ground around the leak.Radioisotopes used to find leaks are ones that emit gamma radiation with a short half-life.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.

Once an organism dies it stops taking in Carbon in any form.All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.Gamma rays can easily penetrate pipes (even if they are underground) and reach the detector.Both alpha and beta particles would not pass through pipes, so could not be used.

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