SIMS-SS (Secondary Ion Mass Spectrometry - Saturation Surface) is a pioneering dating method of ancient obsidian artifacts based on the modelling of water diffusion profile, using the Saturation Surface Approach.

The method makes use of the SIMS analytical technique to measure the profile of water concentration, which has been defused perpendicular to the surface, versus Depth. The profile is properly elaborated for the deduction of the age.

This is an an analytical presentation of the method, an on-line tool for age calculation and a program download is avaliable.

This project works under the supervision of the Laboratory of Archaeometry, University of the Aegean, Greece.