Method of fractionation dating
The ions produced are negative which prevents the confusion of ions). As they travel to the terminal (which is at about 2MV), they are accelerated so much that when they collide with the gas molecules in the central `stripper canal'.
All of the molecular ions (such as Careful sampling and pre-treatment are very important stages in the dating process, particularly for archaeological samples where there is frequently contamination from the soil.
See also specific advantages for Archaeology, Art History, Environmental Science and Biological Tracer Studies Small sample sizes do have their disadvantages too: greater mobility within deposits and more difficulty in controlling contaminants.
The best conventional counters can still achieve higher precision and lower backgrounds than an AMS system assuming a suitably large pure sample can be found.
In all I can say that the best seduction technique out there is fractionation.
Though it sounds complicated, it is really so simple I believe anyone can use it – that includes you!
The chemical pre-treatment depends on the type of sample.
Most of the failures were when I was just starting to date.The sample is put into the ion source either as graphite or as carbon dioxide.It is ionised by bombarding it with caesium ions and then focused into fast-moving beam (energy typically 25ke V).The carbon dioxide is collected in a glass ampoule or converted to graphite for radiocarbon measurement on the AMS system.-counting method are the much greater sensitivity of the measurement.