We are interested to know the defect per unit area in graphite due to broad band ion irradiation.
The paper published in Phys. Rev. in 2010 and references in it may be helpful.
There is also a review of various defects in graphite there.
"Magnetic properties of graphite irradiated with MeV ions".
Search also for papers published by J. Roth, R. Behrish and others in the Max Planck Institute for Plasma Research, in Garching, Munich, Germany.
It is possible to experimentally measure the dose of ions required for a transition from crystalline to amorphous. There are around 10 in-situ ion-irradiation TEM characterisation facilities worldwide where you could carry out this experiment (Argonne National Labs, Chicago has one, Univeristy of Paris South Orsay, also has one). By collecting electron diffraction patterns during ion-irradiation it is possible to monitor the crystallinity and determine the fraction of amorphous material.
There are several software programs with which you can simulate damage accumulation. SRIM is one of the easiest and more well known damage simulators. The calculated interstitials and vacancies tend to be over-estimated in SRIM but whether this truely matters depends on what it is you are trying to achieve.
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