Chloride Isolation for Accelerator Mass Spectrometry of ³⁶Cl Produced by Atomic Bomb Neutrons

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Accelerator mass spectrometry was performed at the Munich tandem laboratory to determine the ratio of ³⁶Cl/Cl in silicate rock samples exposed to neutrons of the Hiroshima atomic bomb. Chloride was chemically separated from silicate rock for this purpose. Five grams of silicate rock was fused with 30g of sodium hydroxide and dissolved in 900ml of water. The chloride in the resulting solution was spectrophotometrically determined. Chloride was precipitated as silver chloride by addition of appropriate amounts of silver nitrate, and silver chloride was then collected on a membrane filter. The chloride in the rock samples was thus isolated quantitatively.