Development of accelerator mass spectrometry assisted by isotope-selective laser photodetachment for monitoring 129I

A prototype system was developed to investigate an isotope-selective laser photodetachment technique for a 129I accelerator mass spectrometer. A pulsed ion source for negative iodine ions (I−) that employed laser ablation proved to be suitable for isotope-selective laser photodetachment. Laser photodetachment of pulsed negative iodine ions was estimated to have an efficiency of about 81% based on a model calculation for the prototype system with a tunable pulsed Ti:sapphire laser. •We investigated 129I-AMS assisted by isotope selective laser photo-detachment.•We developed proto-type apparatus for laser photo-detachment.•Developed pulsed negative ion source seems to be suitable for proposal method.•The efficiency of laser photo-detachment was estimated.