The Cl-36 method uses chlorine as an isotope. Chlorine has two isotopes. One is radioactive and is known as 36 chlorine. It has a half-life of 301000 years with an uncertainty of about 2000 years. The samples are fi8rst dissolved in distilled deionized water. The chlorine is ten precipitated by adding silver nitrate that precipitates as silver chloride and sinks to the bottom.
The supernatant liquid is then discarded. The AgCl is then purified and then sealed in tight bottles and the radioactive chloride concentration is measured by AMS. The ratio of chloride to radioactive chloride determines the actual age of the sample.
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