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    Deuterium is particularly useful to forensic scientists.

    Numerous laboratories analyze for stable isotopes using IRMS;see ISOGEOCHEM (an Internet discussion list) for links to many of them. Every molecule in our bodies—including those found in hair—are made up not just of different elements, but of different ratios of stable isotopes of those elements. In its most common form, it has one proton and one electron.There are also two less common isotopes, deuterium and tritium, which have one and two neutrons, respectively, in addition to their proton and electron.When archaeological bone material is poorly preserved there may not be enough surviving biological material left for the analysis to be reliable.However, in cases where the bones are well preserved, the isotopic signatures are considered to be representative of the individual specimen (either human or animal) that is being studied.

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