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Accelerator mass spectrometry (AMS) was applied to the analysis of  36 Cl induced in concrete samples obtained from accelerator facilities. In order to use a small amount of concrete sample and to separate chlorine as pure as possible, an improvement of separation process was developped. Chlorine was extracted from 1–5 g of concrete into 0.01 M nitric acid in a pressurized decomposition vessel. After determining chlorine using ion chromatography, a certain amount of NaCl solution was added to obtain sufficient amounts of AgCl precipitate and to dilute to a suitable isotope ratio of  36 Cl to  35 Cl ( 36 Cl/ 35 Cl) for the AMS (10 -12 –10 -10 ). A careful purification procedure was applied to reduce  36 S interference in AMS. Good reproducibility and small error throughout the chemical process for sample preparation was attained. Depth profiles of  36 Cl/ 35 Cl in concrete of a medium-energy cyclotron were measured by the developed method and compared with the results of γ-emitters induced by thermal neutrons. Since it was confirmed that  36 Cl was produced by thermal neutron capture of  35 Cl, the thermal neutron fluence irradiated during accelerator operation could be obtained using  36 Cl/ 35 Cl. In order to estimate the neutron fluences, the  36 Cl/ 35 Cl measurement by AMS is more useful than radioactivity measurements of other isotopes such as γ-emitters because AMS directly provides the isotope ratio and the half-life of  36 Cl is very long.

AMS analysis of 36 Cl induced in concrete of accelerator facilities