  Positron Annihilation Lifetime Spectroscopy (PALS) has shown to be a powerful
tool to study the nanostructures of porous materials. Positron Emissions
Tomography (PET) are devices allowing imaging of metabolic processes e.g. in
human bodies. A newly developed device, the J-PET (Jagiellonian PET), will
allow PALS in addition to imaging, thus combining both analyses providing new
methods for physics and medicine. In this contribution we present a computer
program that is compatible with the J-PET software. We compare its performance
with the standard program LT 9.0 by using PALS data from hexane measurements at
different temperatures. Our program is based on an iterative procedure, and our
fits prove that it performs as good as LT 9.0.
