Abstract

Measurement of 32Si by accelerator mass spectrometry (AMS) at relatively low energy was undertaken at the Naval Research Laboratory. Measurement of this naturally occurring radioisotope is difficult due to the low level of production of the radioisotope and the ubiquitous nature of the stable isobaric interference, 32S. The isobar suppression was enacted using a new chemical separation and the differential energy loss profile of the 32Si and 32S ions after their transmission through a thin carbon foil. Determination of the energy loss and energy straggle profiles of the transmitted ion beam were made and compared to the predictions made using TRIM code.

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