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the field deflects atoms of different masses differently (heavier atoms deflect less).Targets tuned to different atomic weights count the number of c12, c13, and c 14 atoms in a sample.A more recent innovation is the direct counting of c14 atoms by accelerator mass spectrometers (AMS).The sample is converted to graphite and mounted in an ion source from which it is sputtered and accelerated through a magnetic field.The collagen fraction usually yields more reliable dates than the apatite fraction (see Dates on bones).In addition to various pre-treatments, the sample must be burned and converted to a form suitable for the counter.Most samples require chemical pre-treatment to ensure their purity or to recover particular components of the material.The objective of pre-treatment is to ensure that the carbon being analyzed is native to the sample submitted for dating.
Since there are practical limits to the age range of the method, most samples must be younger than 50,000 years and older than 100 years.
For example, it was once standard practice to simply burn whole bones, but the results were eventually seen to be unreliable.
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