  A new technique for ion identification in Accelerator Mass Spectrometry (AMS)
has been proposed by measuring the ion track ranges using a low-pressure TPC.
As a proof of principle, a low-pressure TPC with charge readout using a THGEM
multiplier was developed. The tracks of alpha particles from various
radioactive sources were successfully recorded in the TPC. The track ranges
were measured with a high accuracy, reaching the 2% resolution level. Using
these results and the SRIM code simulation, it is shown that the isobaric boron
and beryllium ions can be effectively separated at ten sigma level. It is
expected that this technique will be applied in the AMS facility in Novosibirsk
for dating geological objects, in particular for the geochronology of Cenozoic
Era.

Instrumentation and Detectors;Nuclear Experiment